Polyester-polyurethane hybrid resin molding compositions

Details Polyester-polyurethane hybrid resin molding compositions Polyester-polyurethane hybrid resin molding compositions

1990-08-30

1992-10-06

Seidleck, James J.

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

Synthetic resins

Ethylenically unsaturated reactant admixed with either...

525 29, 525440, 525445, C08F29500, C08L 6702, C08L 7504

Patent

active

051532611

ABSTRACT:
Polyester-polyurethane hybrid resin molding compositions having a first, soft polyurea phase within a second, more rigid polyester-polyurethane phase are disclosed. The compositions are formed by the reaction of an A side composition and a B side composition. The A side composition comprises a polyfunctional isocyanate compound and a free radical polymerization catalyst. The B side composition comprises a mixture of (i) an ethylenically unsaturated monomer solution having dissolved therein about 40-90 weight percent of a substantially water-free, unsaturated polyester polyol having at least one dicarboxylic alkene moiety and having an acid number less than five; and (ii) a polyfunctional nitrogen-containing compound having at least one active hydrogen atom on each of at least two nitrogen atoms in each molecule, which, when reacted with the A side composition, has a molecular weight sufficient to form the first, soft polyurea phase. The A and B side compositions, which are reacted at the time of molding, have a ratio of active NCO groups of the isocyanate to NH groups of the nitrogen-containing compound of between about 3:1 to about 100:1, a ratio of active NCO groups to active OH groups in the polyester polyol of between about 0.5:1 and about 6:1, such that the stoichiometric index NCO:(NH+OH) is between about 0.5 and about 2.0.

REFERENCES:
patent: 4296020 (1981-10-01), Magrans, Jr.
patent: 4868231 (1989-09-01), Lenke et al.
patent: 4880872 (1989-11-01), Thomas
Edwards, H. R. "Handling and Physical Properties of Hybrid Polyesters", 39th Ann. Conf. Reinforced Plastics/Composites Institute, The Society of the Plastics Industry, Inc. Jan. 16-19, (1984), pp. 1-8.

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