Abstract: The present invention relates to a closure and a container having the same. The closure includes a sealing portion 110 assembled to an aperture of a container to seal the container; a plurality of locking protrusions 112, each lock protrusion being connected to a hinge 111 extending from a lower rim of the sealing portion 110 to protrude inwards and fixed to a locking flange formed on the container; a cover portion 120 having a ring shape and assembled to an outside of the sealing portion 110 to be vertically movable with respect to the sealing portion 110; and a plurality of fixing protrusions 121 protruding from an inner circumferential surface of the cover portion 120 to support the locking protrusions 112. The closure may be opened or closed by just one touch by means of relative vertical movements of the sealing portion and the cover portion, thereby ensuring convenient manipulation as well as excellent airtightness.

Abstract: A lock chamber for a substrate processing system is provided which includes at least a first conduit adapted to provide an inner portion of the lock chamber in fluid communication with atmospheric pressure or overpressure. Additionally, the lock chamber includes at least a first control valve for controlling a flow rate of the fluid communication of the inner portion of the chamber with the atmospheric pressure or the overpressure, wherein the control valve is adapted to continuously control the flow rate. Furthermore, an according method, a computer program and a computer readable medium adapted for performing the method is provided.

Abstract: A tank for receiving a drink to be dispensed, the tank is rectangular in shape and opens upwardly, a discharge valve is located at the lower, front end of the tank, and a cover fits over the open end of the tank. Detents are formed at the upper end of the walls of the tank. A manually operable locking mechanism secures the cover in fixed position atop the tank. The locking mechanism comprises a vertical shaft or axle that extends through the central part of the cover. A knob is secured to the upper end of the shaft, and a cam is secured to the lower end of the shaft. A plurality of elongated rods pass through diametrically opposed slots in a housing secured to the underside, or interior, of the cover. One end of each rod has a contact surface which is urged against the perimeter of the cam, while the opposite end of the is a locking surface. When the knob is rotated in one direction, the locking surfaces of the rods are forced into the detents to lock the cover in fixed position.

Abstract: In a female connector 15 of the present invention, a surface of an engagement wall 217 facing an engagement tab 14 when the female connector 15 is connected to a male connector 10 includes an inclined surface 222 which the engagement tab 14 mounts in a sliding direction of the engagement tab 14 with respect to the engagement wall 217 during the connection between the female connector 15 and the male connector 10. Further, in a male connector 30 of the present invention, a surface of the engagement tab 34 opposed to the engagement wall 417 when the female connector 35 is connected to the male connector 30 includes an inclined surface 34a which the engagement wall 417 mounts in a sliding direction of the engagement wall 417 with respect to the engagement tab 34 when during the connection between the female connector 35 and the male connector 30.

Abstract: A transparent rigid-material container (1), has an access mouth (11) and is fitted with a closing cover (2) with a rear appendix (21) for coupling, in an axial direction, with the container mouth (11); with the container mouth (11) and the rear appendix (21) of the cover presenting similar, irregular outlines for coupling in a single position; and the cover (21) includes an electronic circuit (3) that includes an electronic control card (31), and a data memory (33), a data entry and downloading arrangement (32a, 32b, 32c), a data display screen (34), an electric battery (35) and a low-consumption electromechanical lock (36), all connected with the data memory (33).

Abstract: The invention relates to a blood plasma collecting flask made of plastic for the storage of blood plasma in the frozen state, comprising a flask body (1) which in the horizontal section has a cross-section with a rectangular basic shape and has on its upper side a flask neck (2), wherein the lateral faces of the flask body (2) respectively define a flat or slightly inwardly curved area (3) adjoining which are areas rounded towards the face surfaces.

Abstract: Provided is a novel technology for determining the cause of a faulty insertion of a block body into a plug blade insertion hole, and for solving that problem fundamentally. The externally extending shapes of a ceiling plate and a rotary frame are made circular by using the novel technology as the core technology, to thereby make improvements including the integration of a locking function and a power supply connection function. A selection is made which of a rotary frame (4) or a ceiling plate (22) is used as a reference, and a rotary track is set for the selected reference with the intersection of a longitudinal center line and a lateral center line used as the center of a circle. A new rotary track is provided for the other with the intersection of a lateral center line before rotation and a lateral center line after rotation used as the center of a circle in a state where the longitudinal center line is always aligned with the longitudinal center line of the selected reference.

Abstract: The present invention is directed to containers for food or other material having a bowl and a ratcheting lid. The ratcheting lid will reduce the headspace in the container thereby increasing the storage life for the food product or other material in the container and maintaining the freshness of the material. The lid includes a peripheral edge having a diameter corresponding generally to the inside diameter of the bowl to provide an improved locking seal.

Abstract: The case includes a case main body, a cove mounted at the case main body, and lock members fixing the case main body and the cover by supporting one end of the lock member rotatably at the cover and hooking the other end of the lock member at a lock portion provided at the case main body. The lock members are arranged between one ends of the case main body and the cover and between the other ends of the case main body and the cover. A fat surface portion, on which an edge of the cover is overlapped, and a recess formed by cutting a part from the flat surface portion so as to make a gap between the edge and the case main body when the case main body and the cover are fixed by the lock members are provided at the case main body.

Abstract: A child resistant container (10) has a container cavity (20) for the receipt of one or more items to be stored therein. The container cavity (20) is defined by a pair of lids (14, 16) which are hingedly connected to one another. Primary lock means (50) includes a first lock assembly on one lid (14, 16) which engages with a second lock assembly on the other lid (14, 16). A primary lock actuation includes an externally open topped pocket (60) formed in the body of said one lid (14, 16). The pocket (60) has a pocket side wall (62) which is resiliently deflectable from a lock position to an unlock position. The pocket (60) is shaped and sized to permit a finger of an operative to enter the pocket (60) to effect deflection of the pocket side wall (62) to its unlock position.

Abstract: A disposable food container forms a pouch or pocket having a closed ends and sides, as well as a mouth or opening. A substantially rigid member forms the opening of the mouth to provide support to the container, and to permit only a desired amount of food to extend out of the mouth of the container. A user can easily control the amount of food that protrudes out of the container by applying pressure to the outside of the container and pushing only a desired amount of food out of the mouth of the container. The remainder of the food remains enclosed within the container, thereby preventing unwanted touching of such food and spillage.

Abstract: A reusable container for the sterile transfer of pharmaceutical recipients, in particular of syringe bodies. The container comprises an outer case and a sterilizable interior, wherein the interior is microbially isolated from the environment of the container. The interior has at least one holder for accommodating at least one nest for storing a plurality of pharmaceutical recipients. The nest can be removably accommodated in the holder. The container further has at least one container door for removing or introducing the nest into the interior and at least one lock for coupling the container to a sterile space. The lock is configured in such a way that, after coupling to the sterile space, it is possible to open the container door without substantially suspending sterility.

Abstract: A container and closure assembly includes a container and a closure. The container defines an opening and includes a lip positioned around the opening. The closure includes a top portion defining a periphery, a skirt, a first and second blocking structure, a tab, a plurality of spaced apart first ribs, a plurality of spaced apart second ribs, and a plurality of first rib extensions. The skirt defines an internal closure space and including (i) a first skirt portion extending downwardly from the periphery, and (ii) a second skirt portion extending downwardly from a first part of the first skirt portion. The second skirt portion includes a first side edge and a second side edge that are spaced apart from each other to form a gap. The first blocking structure is secured to the skirt. The tab extends downwardly from a second part of the first skirt portion and is positioned in the gap.

Abstract: A dumpster includes a plastic body with first and second plastic lids that are pivotally attached to the body. A divider is secured to the body to separate a dumpster interior into first and second compartments. The first lid covers the first compartment and the second lid covers the second compartment. The dumpster includes a locking assembly that allows one lid to be locked while the other lid remains unlocked, and which also allows both lids to be locked at the same time. Each lid includes a support frame to provide reinforcement during an emptying process when one lid is locked.

Abstract: An adapter for taking up a sample container and for use in a laboratory centrifuge rotor, the adapter including a closed end, an opened end and closure assembly that releasably seals the opened end. The closed end and the opened end can be of a certain diameter. The adapter can also be a certain shape. The closure assembly can also include a handle, flange, a hold down ring, a sealing ring and bottom support for the sealing ring, hold down ring, flange and handle.

Abstract: Apparatus and methods for securing and/or tracking a solid waste container using a locking mechanism.

Abstract: A pressure vessel having a cell with a locking pin, and a cap and associated methods and systems. The locking pin may be configured to engage the cap when the pressure vessel is pressurized to prevent rotation of the cap without depression of the cap.

Abstract: An anti-twist device for a sealing cap that is located on a fixed connecting piece of a motor vehicle radiator. The sealing cap comprises an external cap part with a grip element and a sealing element, which can be connected to a counter sealing element of the connecting piece and in relation to which the grip element can be rotated. The sealing cap also comprises an internal cap part comprising a valve assembly that is configured in an excess/negative pressure combination. An anti-twist stop acts in the external cap part between the grip element and the sealing element. An anti-twist device of this type has a no-load function instead of a locking function and yet has a simple construction and is easy to produce. To achieve this, the anti-twist stop can be actuated by means of a drive, which is controlled by the operating data in the container and is located inside said container in close proximity to the external cap part.

Abstract: A collapsible underhood container for mounting under a vehicle hood with a portion of the collapsible underhood container extending into an area between the hood and an underhood safety plane when in an extended position, the container comprising: a lower housing, an upper container portion and a locking feature. The lower housing is fixed relative to the vehicle and has a bottom and side walls. The upper container portion has walls adjacent to and telescopically slidable on the side walls of the lower housing and a top, with the top located in the area between the hood and the safety plane. The locking feature maintains the upper container relative to the lower housing when in the extended position and releases the upper container portion to slide downward relative to the lower housing to a collapsed position when the hood contacts the upper container.

Abstract: A receptacle (2) for organic waste, the receptacle intended for the storage and transport of the said waste once contained within a plastic bag or the like is provided, the receptacle comprising a housing (4) for containing the organic waste having an opening (8) therein; a lid (14) for closing the opening in the housing; fastening means (26,28) for securing the lid in a closed position over the opening in the housing, the fastening means allowing the passage of air therethrough; and a seal assembly (30) disposed to seal the opening in the housing when the lid is in the closed position. The receptacle may comprise a scented or perfumed element (40), preferably a disc of scented or perfumed material removably disposed in the housing. The housing and lid are preferably formed from a flexible, washable material, in particular a chloroprene polymer.

Abstract: A container (10) for holding at least one article (32, 132) includes a sleeve (12, 112), a top (16, 116) located at one end of the sleeve (12, 112), and a base (14, 114, 214) located at an opposite end of the sleeve (12, 112). The container (10) includes a locking mechanism (54, 56, 154, 156, 158, 254, 256, 258) that provides means for releasably securing the sleeve (12, 112) to the base (14, 114, 214). A support structure (28, 128, 228) is positioned on the base (14, 114, 214) and includes a recess (44, 144, 244) for receiving an article (32, 132) and an arm (46, 246) that is proximate to the recess (44, 144, 244) and configured to contact the article (32, 132).

Abstract: The invention relates to a lid (1) for placement on a container, said lid comprising a top wall (2), a circumferential wall (3) extending downwardly from said top wall, said circumferential wall ending in a flange (4), said flange comprising a circumferential wall part (5) extending outwardly from said circumferential wall for resting on an upper rim of said container and a circumferential locking wall (6) extending downwardly from said wall part for encircling the upper rim of said container, said locking wall comprising at least two solid notches (7) for snappingly attaching said lid around said upper rim of said container, and wherein said lid is made from hot-pressed moulded fibre material.

Abstract: The invention provides a closures (106) for a compartment (100) having one or more walls (112, 114, 116, 118) and an opening (110) defined by at least one of the walls (112, 114, 116, 118). The closure (106) is associated with at least one fastener located inside the compartment (100). The fastener can hold the closure (106) in a first position (eg. closed) relative to the opening (110). The fastener is adapted to cause the closure (106) to assume a second position (eg. open) relative to the opening (110) upon receipt of a suitable signal. The closure (106) has at least on indicium (108) visible from outside the compartment (110). The indicium (108) is adapted to provide a visual indication of a status of the closure (106) or the compartment (110), such as closure open, closure closed, compartment empty, compartment occupied.

Abstract: A releasably locking lid for a beverage container is disclosed. More specifically, lid embodiments include an outer surface, an inner surface, and a lip, the lid including a center piece and an outer ring that is configured to rotate relative to the center piece to releasably lock the container within a receiving space in the lid.

Abstract: A canister includes a body having a shell, a lid, and a handle mechanism. The handle mechanism includes a lever that actuates to engage and disengage a latch pivoted on the lever for locking and unlocking the lid to the body. The lever mates to a fixed handle portion to complete a handle for facilitating handling of the canister. The canister can further include wheels for transporting the canister. The lid can include an elastic portion to press against the body to create a seal. The canister can further include a utensil attached to the underside of the lid, for use to scoop the content from the canister.

Abstract: The present application is directed to an assembly for sealing an opening of a container, comprising (1) a first member operationally configured to connect to the container at the opening; (2) a second member operationally configured to abut the first member in a manner effective to cover the opening of the container; and (3) a temperature-sensitive fastening means operationally configured to releasably secure the second member to the first member in a manner effective to form a seal there between; wherein at least part of the fastening means is positioned apart from the second member.

Abstract: An apparatus including a body part configured to receive a replaceable internal part, a first cover part configured to be movable between an open position and a closed position, a second cover part configured to be movable between an open position and a closed position, and when in said closed position, to cover the replaceable internal part. A locking mechanism is configured to lock the second cover part to the body part and the locking mechanism is configured to be releasable, when the first cover part is in said open position and the locking mechanism is configured to be unreleasable, when the first cover part is in said closed position.

Abstract: A connector system for attaching a liquid container to a spray gun includes a lid with a liquid outlet and an adapter that connects the outlet with the liquid inlet port of the gun. The lid includes interlocking tab assemblies for releasably attaching the adapter to the lid. The connector system combines with an outer cup, a ring for insertion into the mouth of the cup and a collapsible liner for insertion into the ring to form a liquid container system. The ring includes internal threads that cooperate with a peripheral flange on the lid to lock the lid to the ring, securing the lip of the liner. The lid includes a flexible gasket to form a liquid tight seal with the liner. The lid-liner-ring forms a liquid tight unit that may be inserted into and removed from the outer cup while containing a fluid such as paint.

Abstract: The invention relates to a container (1) comprising a bottom, a wall (2) and a closing sheet (4) directed from the bottom for closing the container (1), wherein the closing sheet (4) is directly attached to and in contact with the wall (2). The invention also relates to a method for producing a container (1) according to the invention, wherein preferably the closing sheet (4) is first attached to a ring (5), whereafter the ring (5) is arranged to the container (1).

Abstract: Child-resistant bulk dose dispensing packaging unit, and a method for opening the packaging unit, including a container and a lid engaged with the container. The container includes a reservoir, an aperture at a top end of the reservoir, and a protrusion extending from a surface of the container. The lid engages with the container and slides between a closed position and an open position. The lid includes a top wall, a side wall extending down from an outer edge of the top wall, and a post configured to engage the protrusion at a first position when the lid is closed so as to keep the lid closed. At least a portion of the post extends substantially parallel to the side wall at a distance from the side wall. Pressing the side wall inward places the post at a second position, wherein at the second position the post is disengaged from the protrusion.

Abstract: A loosening prevention device (1) for a plug includes: a first sleeve (11) engaged with and surrounding a first plug (70) attached to a lid of a liquid tank (60); a second sleeve (21) engaged with and surrounding a second plug (80) attached to the lid; and a connection means (24) for connecting and fixing the first sleeve and the second sleeve with each other. At least one flat surface (75, 85) is formed on an outer circumferential surface (74, 84) of both or either one of the first plug and the second plug, and at least one flat surface (12, 22) in surface contact with the flat surface of both or either one of the first plug and the second plug is formed on an inner circumferential surface of both or either one of the first sleeve and the second sleeve. With this arrangement, a plug for supplying pressurized-gas and a plug for discharging liquid can be firmly held.

Abstract: A container having a top cover and a bottom cover is provided, which includes a canopy disposed on the bottom cover to form therewith a space to accommodate an article. A plurality of locators is disposed on a surface of the bottom cover so that when the bottom cover is tightly combined with the top cover, the locators are clipped between the bottom cover and the top cover to orient the canopy in a fixed position.

Abstract: A clamshell-style food container having a beverage holder that can also act as a closure mechanism for securing the container in a closed configuration. In some embodiments, the food container also has multiple compartments for separating food items.

Abstract: Packaging comprising a container with an upper opening (21), the container having a peripheral outer surface near the opening, and a closure system made up of a frame (31) fixed to the container, and a lid (32) hinged to the frame and able to close the opening of the container when in a closed position. To protect the contents of the container, the invention provides in the closed position: at least one container/frame sealing region formed by an annular contact (C1) between the frame and the peripheral outer surface of the container; at least one frame/lid sealing region formed by an annular contact (C2) between the lid and the frame; and at least one additional container/lid sealing region formed by an annular contact (C3) between the lid and the peripheral outer surface of the container, and situated between the opening of the container and said container/frame and frame/lid sealing regions.

Abstract: A closure for pressure vessels provides ease in access to the inside of a pressure vessel and at the same time provides a tight pressure seal for the closure. The closure for pressure vessels includes a hub adapted to fit on to an opening on the pressure vessel, a door connected to the hub, a hinge assembly to secure the door to the hub, and a locking assembly attached to the door. The locking assembly includes a slide lock operating around a central support, a plurality of locking lug arms radially operating around the central support, a pressure alert valve connected to the door, and a handle connected to the slide plate operating around the central support. The handle moves the locking assembly from a locking position to an unlocking position as the result of the groove pattern machined in the back of the slide plate.

Abstract: A container is provided for holding a chemical compound or mixture. Areas are provided on the surface of the container which allow for gaseous by-products from the chemical contained within the container to permeate from a chamber through the surface of the container. A septum is over-molded into the surface of the container. The septum is formed in such a manner that it provides a sealing effect to close an opening in the container.

Abstract: An airtight cooler box having a base panel, a collapsible unitary side panel sized and folded to extend orthogonally from the base to form an enclosure with a top opening defined by the side panel top edges. A top panel is included, the top panel sized and folded on an edge to extend orthogonally from the unitary side panel and further sized for top panel three edges to fit the top opening, the top panel further comprising a plurality of pouches positioned on an inside surface. A rigid base plate is included, the rigid base plate being sized to cover the base panel when the rigid base plate is positioned inside the container resting on a base panel inside surface. The cooler box further includes a rigid top plate having a plurality of vent openings through the rigid top plate corresponding to the position of pouches positioned on the top panel inside surface and sized to be located inside the container under the top panel inside surface.

Abstract: A push tab container assembly includes a container and a lid configured to mate with the container in an unlocked state and in a locked state. The container includes a push tab assembly having a locking member defining a ramped surface and ending at a locking edge. The locking edge is vertically oriented with respect to the ramped surface and is tapered as it extends radially inwardly. The container has exactly one external container thread positioned on an external surface and at least one internal thread positioned on an internal surface. The lid has at least one locking lug positioned on an internal surface of a second skirt. The locking lug has a lug edge that tapers as it extends radially inwardly. When the lid is operably oriented relative to the container in the unlocked state, the external lid thread is mated with the internal container thread.

Abstract: A device to prevent removal of fuel and oil caps includes: a pin having a shaft, a flat head at an end of the shaft, and an aperture through the shaft; a washer that fits over the shaft of the pin and retains the head of the pin; an adhesive that fixes the washer to the cap; a cover that is rotatably retained over the cap by the pin; and a lock that engages with the aperture in the shaft, thereby rotatably retaining the cover over the cap and deterring removal of the cap. The adhesive may be sticky tape. A kit also includes sandpaper to clean the cap.

Abstract: A container assembly such as a petri dish or a contact plate for use as a sampling device for microorganisms includes a base member, a lid and a locking mechanism that provides a secure locking engagement between the lid and the base member. The locking mechanism is designed such that does not lock except upon application of a specific intentionally applied compressive force, and which may be readily disengaged from locking engagement without the need for a rotational movement or torsional force.

Abstract: The invention relates to a securing element (10) for a closing element (20), said closing element (20) having a center piece (21) which comprises an actuation zone (22), and holding means (23). The closing element (20) closes an opening (31) of a container (30) which has a longitudinal axis (34) in a first position (I) and releases the same in a second position (II), the holding means (23) being in positive fit with the container in the first position (I). The closing element (20) can be brought from the first into the second position (I, II) by the action of a pressure onto the actuation zone (22) in the direction of the container (30) so that the holding means (23) releases the form fit.

Abstract: A container or package for pizzas, made of thermoplastic material, including a cover (1) and a dish or plate (2), wherein the cover (1) has a plurality of first holes (8) arranged centrally and a plurality of second holes (6) arranged along its circumference or circular edge (or in the neighborhood of the latter). Several radial channels (11) interconnect these two pluralities of holes (6 and 8). Preferably, the container (1, 2) is transparent; thereby allowing to recognize the kind of food it contains.

Abstract: A drain cover with a locking mechanism which includes a cylindrical body with a first end, a second end, an end wall at the first end and a peripheral sidewall that extends between the first end and the second end. The peripheral sidewall has an exterior surface and an interior surface which define an interior bore. Rotatable fasteners extend from the end wall to the second end. Drain cover is adapted to fit into a pipe. A cam member extends radially from each rotatable fastener. The cam member is movable from a release position to a locking position upon rotation of each rotatable fastener such that in the release position the cam member is spaced from an interior wall of the pipe and in the locking position the cam member is engaged with the interior wall of the pipe.

Abstract: The present invention relates to a closure for an aperture. More specifically, the present invention relates to a closure for an access aperture in a panel, such as a closure for an oil filter access aperture in an engine cover. The present invention comprises a single-piece rotatably-engageable access closure element having a plurality of tension arms and adapted to seal an access aperture having cutouts corresponding to each of the plurality of tension arms.

Abstract: The invention concerns a filter housing (1), in particular of an air filter for motor vehicles, that extends axially along a longitudinal axis (2) and comprises two detachably connected housing parts (3, 4). A locking connection (5) acting in the direction of the longitudinal axis (2) is provided between the two housing parts (3, 4), wherein the locking connection (5) in at least one rotational direction (6) of the first housing part (3) about the longitudinal axis (2) relative to the second housing part (4) can be brought into a position in which the housing parts (3, 4) are detachable in the axial direction.

Abstract: A pressurizable chamber device or containment vessel and method of use thereof. The device or vessel includes two chamber portions, a lid portion and a base portion, drawn to one another via a nut portion. The lid and base portions each include concave surfaces that matingly fit together, such that an internal chamber is formed when these portions are fit together. The lid and base portions each include a flange having a groove therein, such that a flexible seal element is fittable into the groove. The lid and base portions include features to matingly engage the nut portion, such that engagement thereamong draws the lid portion and the base portion toward one another, tightly sealing the formed internal chamber. A pressure, such as a resin pressure that may be precisely regulated, may then be applied, for example, to a mold contained within the formed and tightly sealed chamber.

Abstract: The present invention relates to a cover (1) of a coffee pot (20) or a pot (60) comprising conversion means (8) suitable for converting a thermal gradient, such as a Peltier cell, into an electrical potential difference. The potential difference allows electrically supplying a microprocessor for processing a signal coming from a sensor (13), for example a thermal sensor and the execution of an operation thereof, such as the emission of a sound warning.

Abstract: A wafer container including a container body having an opening formed on one sidewall and a door joining with the opening, the characteristic of the wafer container in that: A latch component disposed in a platform of the door comprising an oval cam with an arrester disposed at its center, one surface of the oval cam being disposed with at least a groove, a pair of moving bars respectively having an engaging portion that is engaged in the groove for the pair of moving bars to be engaged with the oval cam, a guiding element disposed at the center of the oval cam, and a long narrow spring framingly disposed on the guiding element, wherein the arrester is used to control the rotation of the oval cam for the moving bars to go to and fro between the pair of socket holes and the pair of latch holes.

Abstract: A security closure system for terminating the hose-connector connected to the outlet of a storage tank whose contents are to be periodically pumped out. A first male-outlet component is provided with an outer, circumferential annual groove for reception therein of camming elements of camming arms, and has a terminal projecting tongue provided with an opening or hole for receiving a locking device, such as a padlock. The male-component is further provided with an enlarged mounting flange for mounting the male-component to a wall of the storage tank or to a bulkhead adjacent the storage tank. The security closure system also comprises a second female part, which is a female closure cap that matingly receives therein the first male-component. The closure cap has a slot for passing therethrough the tongue of the first male-component, whereby a padlock or other lock may be used for locking the cap in place over the first male-component.

Abstract: Described is a recloseable pack having a cold-sealed layer of adhesive which is recloseable after the pack has been opened, the layer of adhesive comprising an emulsion polymer composed to an extent of at least 60% by weight of principal monomers selected from the group consisting of C1 to C20 alkyl (meth)acrylates, vinyl esters of carboxylic acids comprising up to 20 C atoms, vinylaromatics having up to 20 C atoms, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of alcohols comprising 1 to 10 C atoms, aliphatic hydrocarbons having 2 to 8 C atoms and one or two double bonds, and mixtures of these monomers, the emulsion polymer being preparable by emulsion polymerization of free-radically polymerizable monomers in the presence of at least one protective colloid. Also described are aqueous polymer dispersions suitable for producing the pack of the invention, and polymer films coated with the polymer dispersions.