William A Sprenger

US Patent:

42450683, Jan 13, 1981

Filed:

Dec 27, 1977

Appl. No.:

5/864978

Inventors:

James L. Brewbaker - Midland MI
Rodrique L. Marzett - Midland MI
William A. Sprenger - Coleman MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 6706

US Classification:

525447

Abstract:

The shrinkage of a thermosettable composition comprising an unsaturated polyester and a vinyl monomer capable of cross-linking the polyester is reduced during cure by the addition to the composition of an alkylene oxide polymer which is soluble in the thermosettable composition but which is substantially less soluble in the cured thermoset composition.

US Patent:

41512197, Apr 24, 1979

Filed:

Apr 26, 1978

Appl. No.:

5/899921

Inventors:

James L. Brewbaker - Midland MI
William A. Sprenger - Coleman MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

C08L 6300

US Classification:

260836

Abstract:

Low shrink and low profile reinforced plastic systems are prepared from vinyl ester resins by incorporating therein an additive having the formula: ##STR1## WHEREIN R. sub. 1 and R. sub. 2 are hydrogen, methyl or ethyl with the provision that, if either R. sub. 1 or R. sub. 2 is hydrogen, the other is methyl or ethyl, n and m are whole numbers such that said additive is soluble in said resin when uncured and insoluble in said resin when cured; and B is the residue of a hydroxyl containing initiating compound. Typical of such compounds are water, ethylene glycol, glycerine and phenol. The value of p is equal to or less than the number of hydroxyls in the initiating compound.