Abstract: An improved process for preparing pressure-sensitive adhesive film and tape by extrusion of a relatively high molecular weight thermoplastic elastomer with a relatively low molecular weight tackifier resin is described. An apparatus suitable for carrying out the extrusion is also described.

Abstract: Particulate absorbents of a water-insoluble water-swellable polymer having a gel capacity of at least 10 are immobilized with a composition comprising the absorbent in a liquid polyhydroxy organic compound. The composition may be employed by applying to an appropriate surface and subjecting the liquid film to solidifying conditions. The solidified film product has high absorptive capacity and is free of undesirable movement when positioned in absorbent articles. A foam product having both absorptive and cushioning properties is prepared from a solid, particulate, water-insoluble, water-swellable polymer having a gel capacity of at least 10, a solid, particulate blowing agent, and a liquid polyhydroxy organic compound.

Abstract: The invention provides an absorbent panel which consists of a paper, film or fabric substrate coated on at least one surface with a reactive composition containing from 10 to 40 parts by weight of a liquid polyhydroxy organic compound and from 90 to 60 parts by weight of a particulate water-insoluble, water-swellable absorbent polymer having a gel capacity of at least 10. The absorbent panel is capable of absorbing at least 15 times its weight of liquid and is a thin structure.

Abstract: Particulate absorbents of a water-insoluble water-swellable polymer having a gel capacity of at least 10 are immobilized with a composition comprising the absorbent in a liquid polyhydroxy organic compound. The composition may be employed by applying to an appropriate surface and subjecting the liquid film to solidifying conditions. The solidified film product has high absorptive capacity and is free of undesirable movement when positioned in absorbent articles.A foam product having both absorptive and cushioning properties is prepared from a solid, particulate, water-insoluble, water-swellable polymer having a gel capacity of at least 10, a solid, particulate blowing agent, and a liquid polyhydroxy organic compound. Foamable compositions and articles employing the foam are also described.

Abstract: A foam product having both absorptive and cushioning properties is prepared from a solid, particulate, water-insoluble, water-swellable polymer having a gel capacity of at least 10, a solid, particulate blowing agent, and a liquid polyhydroxy organic compound. Foamable compositions and articles employing the foam are also described.

Abstract: New polymer alloy compositions of a thermoplastic-elastomeric block copolymer and copolyester, and films prepared therefrom are described. The films have superior properties, including resistance to attack by organic solvents.

Abstract: A process of extrusion coating which is particularly useful in the manufacture of viscous pressure-sensitive adhesive sheets and tapes is described. In the process, the distance between the die orifice and contacting substrate, and spaced coating roll and the relationships between the direction of extrusion, the direction of approach of the substrate and the direction of departure of the coated substrate are important.

Abstract: Pressure-sensitive adhesive tapes with various backing films are prepared by a single step process of coextruding a backing film-forming composition and an adhesive composition. No primer is needed. Tapes with release properties are possible without additional preparative procedure.

Abstract: A normally tacky and pressure-sensitive adhesive which is dispersible in water is obtained a composition comprising an acrylate modified polysaccharide, i.e., a polysaccharide polyacrylate, and a polyhydroxy compound by subjecting the composition to a short heat cycle.

Abstract: A process for making a pressure-sensitive adhesive coated product from an elastomer utilizing dry blending of powders and dry coating steps is described. Compositions suitable for use in this process are also described.

Abstract: A flexible non-disintegrative absorbent product comprising a water-insoluble substantially non-swelling matrix of an elastomeric polymer bearing a uniformly dispersed particulate water-insoluble water-swellable organic polymer absorbent. Certain compositions and processes for their preparation as well as articles prepared from the products are described.

Abstract: The invention describes surgical drainage bags suitable for receiving body fluids and wastes. One aspect of the invention is a self-sealing bag of flexible film in which the opening may be sealed by stretching, relaxing and pressing the sides of the opening together. Another aspect of the invention is the incorporation of an absorbent product into surgical bags. The preferred embodiment embraces both these aspects. Suitable materials for the bag and the absorbent products are described.

Abstract: New polymer alloy compositions of a thermoplastic-elastomeric block copolymer and copolyester, and films prepared therefrom are described. The films have superior properties, including resistance to attack by organic solvents.

Abstract: Pressure-sensitive adhesive compositions having solvent resistant properties comprising (a) a synthetic rubbery thermoplastic block-copolymer, (b) a polyester and (c) a tackifier resin.

Abstract: A normally nontacky but potentially tacky adhesive lift-off tape which comprises an adhesive film composition which normally exhibits a plastic nontacky state but is convertible to an elastomeric tacky state by the application of substantial stress, i.e., stretching sufficiently or striking with typewriter type, as well as the process of applying the said adhesive film. This film composition consists essentially of thermoplastic and elastomeric A-B block copolymers wherein the A-blocks are thermoplastic and the B-blocks are elastomeric and about 20-120 parts per one hundred parts by weight of the block copolymers of certain normally solid resins adapted to associate principally with the thermoplastic A-blocks of said copolymers. In these copolymers the A-blocks are derived from styrene or styrene homologues and the B-blocks are derived from conjugated dienes or lower alkenes.

Abstract: A single screw extrusion process for extruding a mixture of relatively high molecular weight thermoplastic elastomer particles and relatively low molecular weight resin particles, wherein the particulate mixture is supercooled and maintained at temperatures below that which would cause the mixture to agglomerate and stick to the screw until the axial driving forces on the mixture have increased to the extent they will overcome any tendency of the mixture to stick to the screw, thereby assuring steady state extrusion conditions.

Abstract: A highly conformable laminated absorbent dressing which comprises an absorbent pad or layer and an elastic backing film which is both elastic and easily deformable and which preferably is highly thermoplastic and easily heat-sealable. The backing film possesses an elastic recovery from 50 percent stretch of at least about 75 percent, preferably at least about 90 percent; a rubber modulus of not above about 2,000, preferably not above about 1,000, pounds per square inch at 50 percent elongation; a Gurley stiffness of not above about one at a thickness of one mil; and preferably is adapted to form permanent heat seals to paper or boxboard at peak temperatures not above about 350.degree. F. in no more than 4 seconds of clamping time. Various other relationships between the backing film of this invention, the absorbent pad and various types of facing layers are described and claimed.

Abstract: A normally nontacky but potentially tacky adhesive lift-off tape which comprises an adhesive film composition which normally exhibits a plastic nontacky state but is convertible to an elastomeric tacky state by the application of substantial stress, i.e., stretching sufficiently or striking with typewriter type, as well as the process of applying the said adhesive film. This film composition consists essentially of thermoplastic and elastomeric A-B block copolymers wherein the A-blocks are thermoplastic and the B-blocks are elastomeric and about 20-120 parts per one hundred parts by weight of the block copolymers of certain normally solid resins adapted to associate principally with the thermoplastic A-blocks of said copolymers. In these copolymers the A-blocks are derived from styrene or styrene homologues and the B-blocks are derived from conjugated dienes or lower alkenes.

Abstract: A broad performance pressure-sensitive adhesive based upon A-B-A and A-B block copolymers. The adhesive possesses a superior balance of properties when extruded and comprises a major proportion of styrene-isoprene-styrene A-B-A block copolymer elastomers and a minor proportion of styrene-isoprene A-B block copolymer elastomers, in its elastomeric component. Suitable proportions of tackifier resins for these elastomers also are included.

Abstract: A highly tacky pressure-sensitive adhesive which possesses superior "finger tack" and skin adhesion, as well as the ability to adhere to oily surfaces. The adhesive comprises a thermoplastic component and a resin component and the thermoplastic component consists essentially of about 55-85 parts, preferably about 60-75 parts, of a simple A-B block copolymer wherein the A-blocks are derived from styrene and the B-blocks are derived from isoprene, and about 15-45 parts, preferably about 25-40 parts, of a linear or radial A-B-A block copolymer. The total styrene-derived A-block content of the copolymers is less than 20 percent of their total weight and the A-blocks of the A-B block copolymers constitute about 10-18, preferably about 12-16, percent by weight of the A-B copolymers. The resin component may be conventional.