摘要:
Low density foams polyethylene blends having substantially closed cell structure and improved compressive strength are prepared using gel-forming extrusion technology. The polyethylene blend comprises from 35 to 60 weight percent of low density branched polyethylene in admixture with from 40 to 65 weight percent of intermediate density linear polyethylene. An exemplary blowing agent is 1,2-dichlorotetrafluoroethane, or 1,2-dichlorotetrafluoroethane used in an amount up to 0.12 gram-mole per 100 grams of resin blend.
摘要:
Foamable compositions comprising water, and a modified non-ionic cellulose ether prepared as described in U.S.Patent 4,228,277 produce very stable foams Accordingly, these compositions are suitable for use as foaming personal care products, such as hair styling mousses and foaming hand lotions and cleansers, and in other applications where stable foams are needed. In personal care products, foaming is desirably effected by an aerosol propellant included in the foamable composition.
摘要:
A substantially closed-celled linear polyolefin foam is made by melt processing under pressure a linear polyolefin together with a volatile blowing agent and a cross-linking agent and then expanding the polymer. Suitable cross- linking agents, including azido and vinyl functional silanes, organic peroxides, multifunctional vinyl monomers, and oxygen, increase the melt tension and melt viscosity of the polymer by lightly cross-linking the polymer with itself to enable the production of foams having improved properties in comparison with branched polyolefin foams.
摘要:
A sprayable and foamable insulating composition comprising: (A) at least one low molecular weight polymer selected from the group consisting of ethylene/alphaolefin copolymer, ethylene/alphaolefin/nonconjugated polyene terpolymer, polyacrylate, polymethacrylate, polyisoprene, polyacrylonitrile, polymethacrylonitrile and polybutadiene; (B) an effective amount of curative; and (C) an effective amount of a blowing agent having an activation temperature which is less than or about equal to the curing temperature of component (B). said composition having a Brookfield viscosity of about 100,000 centipoise or less at shear rates of 5 sec 1 or greater. A process for providing a layer of insulating foam employing such composition is also disclosed
摘要:
The invention proposes a foamable vinyl chloride-based resin composition capable of giving a shaped article having a cellular foamed structure and a beautiful surface with metallic luster. The composition comprises (a) 100 parts by weight of a vinyl chloride-based resin compound of a transparency formulation having a specified transparency, (b) 0.1-5 parts by wight of a powder of a metal or alloy having a specified average particle diameter, (c) 0.01-2 parts by weight of an organic dye or pigment and (d) 0.1-5 parts by weight of a blowing agent.
摘要:
A non-crosslinked foam of a composition comprising (A) 72 to 98% by weight of a 1-butene polymer, and (B) 28 to 2% by weight of a propylene polymer, the percentages being based on the total weight of the 1-butene polymer and the propylene polymer.
摘要:
The resistance to oxidation of polyolefin thermoplastic foams if improved by the incorporation into such foams of a polyvinyl ether of a C₆ - C₃₀ alcohol, preferably polyvinyl octadecyl ether.
摘要:
A polyurethane foam formulation for spraying onto the side walls of moulds is provided. The polyurethane foam formulation comprises (a) a polymer polyol having a viscosity in the range of 3,000 to 8,000 cps at 25°C, (b) an isocyanate selected from toluene diisocyanate; di(4-isocyanatophenyl)methane; or derivatives thereof, (c) a catalyst for the polyurethane forming reaction comprising an amine or a tin derivative and (d) a blowing agent wherein the foam formulation has an index of from 80-120.
摘要:
Adhesive tapes comprised of a curable composition comprising: (A) at least one polymer selected from the group consisting of ethylene/alphaolefin copolymer, ethylene/alphaolefin/nonconjugated polyene terpolymer, said polymer having a number average molecular weight of between about 500 and about 14,000; (B) an effective amount of curative having an activation temperature of at least about 100°C; and (C) (optionally) a blowing agent possess admirable qualities for use as insulating compositions. Also disclosed are composites comprised of a substrate having cured insulating tape compositions adhered thereto.