A method and composition for polymer-reinforced composite cementitious construction materials is described. In one embodiment, a crosslinking component is mixed with a high molecular weight strengthening component and an inorganic cementitious material. The addition of the mixture to water causes a crosslinked molecular network to form within the hydrated, composite cementitious construction material. Both enhanced flexural strength and improved nail-pull resistance are shown, allowing a reducti...

The present invention comprises compositions and methods of making high internal phase emulsion foam (HIPE) and inverse high internal phase emulsion foam (I-HIPE) using super critical fluids. Such foams may be used in a wide variety of articles such as absorbent articles.

A blowing agent blend for making polyolefin foams comprising isopentane and at least one co-blowing agent. The co-blowing agent is either a physical co-blowing agent having a boiling point less than 28.degree. C., or a chemical co-blowing agent, or combinations thereof. The blowing agent blend comprises less than about 99 mol % isopentane.

A thermosetting composition comprising: at least one epoxy resin modified by at least one aromatic polyamine, said resin being formed from at least one polyepoxide containing at least two primary amine groups in its molecule, the mole ratio of the polyamine to the epoxide being such that each amine group corresponds to 1.6 to 2.6 epoxy groups; and at least one pore-forming agent or the degradation product or products of said pore-forming agent; acts to form an alveolar material that can be used ...

A polypropylene composition consisting essentially of from 30 to 80 parts by weight of a crystalline polypropylene, from 10 to 40 parts by weight of a non-crystalline polypropylene, and from 10 to 40 parts by weight of a low density polyethylene. A foamed polypropylene sheet made of the polypropylene composition has excellent impact resistance and a good texture.

Rigid polyethylene foams are prepared by heating a mixture of a linear polyethylene and a hydrocarbon boiling below 30.degree. C. in a closed reaction zone to at least the critical temperature of the hydrocarbon in the absence of stirring, and therafter venting the hydrocarbon at a temperature above or below the melting point of the polyethylene.

Disclosed is a process for producing medium to coarse cell rigid phenolic resin foams having improved abrasion wear by adding to a mixture of phenol-formaldehyde resin, hardening and foaming agent, prior to foaming an additive dispersion consisting of a copolymer of fumaric acid diesters and of a vinyl aromatic compound such as styrene and optionally an olefin such as propylene.

The invention relates to the use of azodicarbonamide as both a vulcanization and blowing agent for polychloroprene rubber. Furthermore, the mixtures of azodicarbonamide, metal oxide and polychloroprene rubber are found to be very stable in storage.

Stable catalyst compositions providing faster cure time in room temperature vulcanizing organopolysiloxane compositions containing them comprise stannous salts of branched chain alkyl carboxylic acids having from 8 to 12 carbon atoms and, as a stabilizing carrier therefor, a methyl alkyl polysiloxane fluid having hydroxy aryl substituents. The catalyst compositions are uniquely adapted to provide injectable compositions curable to low density, high compressive strength syntactic foams, useful, e...

The present invention relates to a method of producing low density polydi resins having high yield strengths and the products thereof. In particular a polydiene resin, such as dihydroxyl terminated 1,2-polybutadiene is reacted at room temperature with an organic chain extender, such as hexamethylene -1,6-diisocyanate, and a graft comonomer such as N-vinyl-2-pyrrolidone in the presence of a peroxide free radical initiator, such as O,O'-bis(t-butyl peroxy) diisopropylbenzene, whereby an elastomeri...