Abstract: A hot melt adhesive composition is based on an isotactic polypropylene random copolymer (RCP). The composition contains about 4%–50% by weight of the RCP copolymer, about 20%–65% by weight of a compatible tackifier, about 0%–40% by weight of a plasticizer, about 0%–3% by weight of a stabilizer, about 0%–40% by weight of a wax, and optionally about 0%–60% by weight of an atactic poly-?-olefin (APAO). The adhesive composition may be used in a number of applications such as, for example, in disposable nonwoven hygienic articles, paper converting, flexible packaging, wood working, carton and case sealing, labeling and other assembly applications.

Abstract: A method and apparatus for post mixing an additive with a hot melt adhesives. The method includes the steps of providing a source of molten hot melt adhesive, feeding the hot melt adhesive to an inlet of a mixer, simultaneously feeding an additive for the hot melt adhesive to the inlet of the mixer, mixing the additive and molten hot melt adhesive in the mixer to form a homogeneous mixture, and recovering the homogenous mixture. The additive is preferably selected from wetness indicators, antimicrobial agents, pigments, dyes, ultraviolet light absorbers, antioxidants, fluorescent agents, pH indicators and fragrances. The method may be practiced either on a batch basis, or on a continuous basis.

Abstract: The present invention provides copolyester compositions and novel methods employing such compositions. The copolymer compositions comprise a copolyester containing a low polarity block in the copolyester backbone, thereby resulting in adhesive and coating materials that exhibit improved flow and wettablility and superior initial adhesion and retained adhesion to various substrates.

Abstract: The present invention relates to a silyated polyether urethane prepolymers prepared from endcap precursors containing dialkyl maleates having alkyl groups containing greater than four carbon atoms which is viscosity stable during compounding, exhibits a relatively fast cure rate, and which has improved sag resistance, extrusion rates, elongation, modulus, and tensile strength. Sealants containing such prepolymers and a process for preparing such sealants is also provided.

Abstract: A high performance, hot melt, single-component sealant which combines the prefered properties of single- and two-component sealants. The sealant comprises a styrene block copolymer, a moisture-curable silylated polyurethane prepolymer, an aromatic tackifier resin, a polar tackifier resin, a polyethylene wax and an organo silane adhesion promoter. Optionally, the sealant may include UV absorbers, antioxidants, plasticizers, catalysts, fillers, pigments, and the like. The sealant does not require mixing before it is applied at a high temperature to the surface that is to be sealed. After application, the sealant forms, upon cooling, a solid elastomer. Upon further exposure to atmospheric moisture, the sealant forms a thermoset crosslinked network having the preferred properties of two-component chemically-cured sealants. The sealant is suitable for use as an edge sealant for insulated glass.

Abstract: Two-component polyurethane sealants, in particular for the direct glazing of motor vehicles, comprising (A) a pasty polyurethane component containing a polyurethane prepolymer having free isocyanate groups, and a curing agent, and (B) a pasty water-containing component, component (A) containing a blocked curing agent which can be liberated by water, and component (B) containing the water, reversibly bonded to a carrier substance which liberates the watering a delayed manner after components (A) and (B) have been mixed.

Abstract: The invention relates to an intumescent one-component sealant based on polyurethane and containing an intumescent agent and a vitreous fusible filler. The intumescent agent and the vitreous filler have been pretreated by reaction with an isocyanate having a functionality of at least 2. The sealant is stable in storage and is an effective fire barrier in the event of fire.

Abstract: A method of formulating a nonflammable water based lubricant emulsion having excellent anti-seize and low friction properties for wood cutting and metal machining containing preferably an oil-in-water emulsion and finely divided polytetrafluoroethylene particles in the water phase and delivered in small amounts by mist or spray to the working parts.

Abstract: A hot-vulcanizable, pumpable rubber-based adhesive/sealant where the rubber component is a mixture of butadiene solid rubber and butadiene or isoprene liquid rubber, and wherein the liquid rubber comprises carboxylic acid groups. The adhesive/sealant compositions of the invention are particularly useful for bonding metal sheeting in the construction of automobile shells.

Abstract: Copolyamide adhesive compositions have a diamine component and a dicarboxylic acid component. The diamine component includes the reaction residues of at least two diamines selected from non-cyclic aliphatic diamines, cycloaliphatic diamines, and aromatic diamines. The dicarboxylic acid component includes the reaction residues of at least two dicarboxylic acids selected from non-cyclic aliphatic dicarboxylic acids, cycloaliphatic dicarboxylic acids, and aromatic dicarboxylic acids. One of the residues is mono-alkyl branched asymmetric. The composition is free from aliphatic omega aminocarboxylic acids or lactams having 12 carbon atoms or less. When one of the dicarboxylic acids is a polymerized fatty acid, the diamine component does not contain a cycloaliphatic diamine.

Abstract: A moisture-curing hot-melt polyurethane adhesive foam comprising isocyanate-terminated polyurethane prepolymers based on polyester or polyether and having a melting point of 40.degree. to 60.degree. C. or a glass transition point above room temperature, melted together, optionally with a nucleating agent and/or a surfactant, treated with an inert gas under pressure and released in ambient pressure is allowed to cure as a foam whereby a cure rate is achieved of at least ten times that of the composition when not foamed; extremely rapid cure rates are achieved and thick bond lines are readily obtained.

Abstract: 2-component polyurethane sealants for the direct glazing of motor vehicles, comprising (A) a pasty polyurethane component containing a polyurethane prepolymer having free isocyanate groups, and a curing agent, and (B) a pasty solvent-containing component, where component (A) contains at least one latent, solvent-activatable curing agent which can be activated by means of solvents, and component (B) contains a polar, aprotic solvent and water reversibly bonded to a carrier substance which liberates the water in a delayed manner after components (A) and (B) have been mixed.

Abstract: High molecular weight polymethylene adipates useful as melt adhesives and sealants, including adipates with molecular weights in excess of 30,000 are disclosed. Also provided is a process for preparing high molecular weight polymethylene adipates by polymerization of an acid and one or more diols with a minute molar excess of diol with respect to acid.

Abstract: High-molecular weight synthetic resins of polyhexamethylene adipates are disclosed with molecular weights greater than about 10,000, preferably greater than about 30,000, and a viscosity at 100.degree. C. of at least about 300 poise, preferably exceeding 6000.The polymerization is carried out with a ratio of diol/acid in the range 0.990 to about 1.03, preferably in the range of about 1.001 to about 1.01.

Abstract: Two-component polyurethane sealants, in particular for the direct glazing of motor vehicles, comprising (A) a pasty polyurethane component containing a polyurethane prepolymer having free isocyanate groups, and a curing agent, and (B) a pasty water-containing component, component (A) containing a blocked curing agent which can be liberated by water, and component (B) containing the water, reversibly bonded to a carrier substance which liberates the water in a delayed manner after components (A) and (B) have been mixed.

Abstract: A quick-setting, moisture-curing hot-melt polyurethane composition having a first polyether-based polyurethane prepolymer having a Tg above room temperature and a second polyurethane prepolymer with a Tg below room temperature, the first prepolymer being prepared from a low molecular weight polyether; preferably the second prepolymer is also polyether based and prepared from a high molecular weight polyether.

Abstract: An improved melting and dispensing apparatus is provided. The apparatus includes an annular drum extender flange which permits the apparatus to be utilized with drums of hot melt or moisture-curable hot melt materials which are completely filled.

Abstract: A moisture-curing hot-melt composition comprising at least one isocyanate-terminated polyurethane prepolymer has improved sag-resistance while retaining high extrudability and is characterised in that the composition includes 1-17 wt %, preferably 3-6 wt %, of hydrophobic, siloxane-coated, fumed silica.Especially effective polyurethane hot-melt adhesive compositions are prepared containing 4-5 wt % of the hydrophobic, siloxane-coated fumed silica.

Abstract: Tough, heat-formable sheet material and mouldable articles produced therefrom comprising a high-molecular weight synthetic resin as stiffening component wherein the stiffening component is a low-melting, highly-crystalline polyesterurethane formed by reacting polyester chains with isocyanate to obtain sufficient molecular weight to give desired properties.Products are especially suitable for use in shoe counters and can be formulated to combined desired mechanical properties with predetermined set-up times during which mouldability is retained to enable several shoe-making operations to be carried out without the need for further heating.

Abstract: Trigger-operated hot-melt dispenser with positive-feed mechanism wherein at least one continuous feed-belt in axial contact with a rod of thermoplastic material and operated to urge said rod into the melt chamber of said hot-melt dispenser is characterized in that release of the trigger first reverses the feed-belt to withdraw the rod a pre-set amount away from the melt-chamber and after a pre-set interval moves the feed-belt transversely out of contact with the rod. This facilitates removal and replacement of a part-spent rod. Preferably the rate of the transverse movement is greater than the tracking speed of the belt. A preferred embodiment includes twin, parallel feed belts which together grip an intervening rod.