Gencorp, Inc.

The General Tire & Rubber Company

Arden E Schmucker

Hubert J Fabris

Robert J Herold

Chia L Wang

Robert L Spencer

Fred V Sandels

Richard H Harshbarger

A two-component urethane adhesive is disclosed which requires no primer or pretreatment of the substrate. The adhesive in cured form has superior paint adhesion and can withstand high temperature bake cycles without substantial losses in adhesion to the substrate. The adhesive differs from prior adhesives in that essentially all of the high molecular weight polyols in the prepolymer component are the reaction product grafting reactions of acrylonitrile onto polypropylene polyols.

Primerless urethane adhesive compositions

A polyurethane adhesive formed from (I) an NCO terminated prepolymer with excess of NCO and talc, and (II) a polyol, a urethane catalyst, talc and a minor amount of certain aryl or aromatic polyamines exhibits good sag and thixotropic properties and, also, exhibits good lap shear strength when cured between treatment-free substrates.

Adhesive composition

A thermoplastic, linear and segmented poly-1,2-propylene ether urethane having a Tg of below about -30.degree. C. for the poly-1,2-propylene ether segments is made by reacting poly-1,2-propylene glycol having a high molecular weight; ethylene glycol, 2,3-butane diol or neopentyl glycol or mixture thereof; and 2,4-tolylene diisocyanate containing from about 55 to 100% by weight of the 2,4-isomer with the balance being the 2,6-isomer.

Thermoplastic polyurethane prepared from a poly-1,2-propylene ether

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Alliance, OH, United States of America

Arden E Schmucker