The Dow Chemical Company

Paul L Neill

Gerald M Lancaster

Kenneth L Bryce

Robert B Turner

Ricky L Tabor

Ralph D Priester, Jr

Larry W Mobley

Laura A Grier

Keith R Plowman

Kenneth W Skaggs

Douglas R Moore

Bradley L Davis

A polymer polyol is prepared by polymerizing one or more ethylenically unsaturated monomers in a polyol. A high molecular weight stabilizer having polymerizable ethylenic unsaturation and a low hydroxyl functionality is used, which leads to improved dispersion stability at reduced stabilizer level.

Stabilizers for preparing polymer polyols, and process for preparing

Novel catalyst compositions comprising complexes of tin(IV) salts and amine compounds are used to prepare polyurethanes, polyureas, polycarbodiimides and polyisocyanurates. The complexes, which preferably employ primary amines, allow delay of gelation until they dissociate under certain reaction conditions. The complexes can be prepared neat or in situ in an active hydrogen containing formulation component. The complexes serve to delay gelation of the formulation because they can be prepared to be relatively stable to moisture and will predictably dissociate upon heating, either as a result of the exothermic nature of the reaction being catalyzed or with application of an external heat source. The catalyst compositions are particularly useful for preparation of carpet underlay and in other applications requiring significant delay prior to gelation.

Process for preparation of polyurethanes utilizing novel catalysts

Melt-reacted blends of ethylene/carboxylic acid copolymers with metal oxides are improved by first incorporating the metal oxide into an ethylene copolymer of LDPE, HDPE, or LLDPE to form a concentrate or masterbatch, then melt-blending a minor amount of the concentrate into the ethylene/carboxylic acid copolymer thereby obtaining a uniform, homogeneous reaction of the metal oxide with the carboxylic acid groups. These melt-reacted blends provide tough molding resins. Especially preferred are melt-reacted blends of EAA with minor amounts of MgO/LLDPE concentrates.

Ethylene copolymers reacted with metal oxides

A retro Diels Alder assisted polymer grafting process in which a Diels Alder adduct is mixed with a polyolefin or polyvinyl polymer substrate and thermally decomposed to form an ethylenically unsaturated monomer which grafts onto the polymer substrate. The monomer conforms generally to the formula R.sub.1 R.sub.2 C.dbd.CHR.sub.3 in which R.sub.1 is hydrogen, methyl or ethyl, R.sub.2 is hydrogen, methyl, ethyl or vinyl and R.sub.3 is a hydroxyl, carboxyl, cyano, formyl, acetyl or propanoyl. The Diels Alder adduct substantially decomposes at a temperature of about 120.degree.-300.degree. C., but does not substantially decompose below about 120.degree. C. The polymer substrate is preferably high-density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-propylene rubber, polypropylene, polystyrene or styrene-butadiene block copolymers. The grafting is induced by, for example, heat, catalyst and/or high shear conditions. Optionally, the polymer mixture is devolatilized to remove any unreacted Diels Alder adduct and decomposition products thereof.

Retro Diels Alder assisted polymer grafting process

Melt-reacted blends of ethylene/ carboxylic acid copolymers with metal oxides are improved by first incorporating the metal oxide into an ethylene copolymer of LDPE, HDPE, or LLDPE to form a concentrate or masterbatch, then melt-blending a minor amount of the concentrate into the ethylene/carboxylic acid copolymer thereby obtaining a uniform, homogeneous reaction of the metal oxide with the carboxylic acid groups. These melt-reacted blends provide tough molding resins. Especially preferred are melt-reacted blends of EAA with minor amounts of MgO/LLDPE concentrates.

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Lake Jackson, TX, United States of America

Paul L Neill