Polyurethane low profile additives for polyester-based molding c

Details Polyurethane low profile additives for polyester-based molding c Polyurethane low profile additives for polyester-based molding c

1994-12-19

1996-12-31

Clark, W. Robinson H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Ethylenically unsaturated reactant admixed with either...

525440, 525453, 525454, C08L 7504, C08L 6706

Patent

active

055895387

ABSTRACT:
Polyurethanes having utility, for example, as low profile additives, in polyester-based molding compositions, a method of preparing polyester-based molding compositions containing such polyurethane low profile additives and thermoset articles made with the method are disclosed. The disclosed polyurethane low profile additives can enhance the pigmentability of molded articles comprising the low profile additives. The low profile additives comprise the reaction product of a hydroxyl-terminated prepolymer and an anhydride such as a dicarboxylic acid anhydride, preferably reacted in the presence of a catalyst comprising an amine having from about 4 to 20 carbon atoms.

REFERENCES:
patent: 4035439 (1977-07-01), Stevenson
patent: 4421894 (1983-12-01), O'Connor et al.
patent: 4758400 (1988-07-01), Dunnavant et al.
patent: 4876296 (1989-10-01), Millet et al.
Computer based literature search on Polyurethane Polymers as Low Profile Additives, plus two updated.
Atkins, et al., Vertical Body Panels: Class A Surface from Flexible Sheet Molding Compound. 46th Annual Conference, Composites Institute, The Society of the Plastics Industry, Inc., Feb. 18-21, 1991.

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