High solids urethanes and application thereof

Details High solids urethanes and application thereof High solids urethanes and application thereof

C - Chemistry, Metallurgy

09

D

117/113, 400/132

C09D 175/04 (2006.01) C08G 18/42 (2006.01) C08G 18/62 (2006.01) C08G 18/65 (2006.01)

Patent

CA 1097837

Abstract A method for applying a polyurethane coating onto a substrate by employing a catalyzed coating composition comprising the steps: 1) providing a coating composition comprised of: A) a polyol composition comprising 1) a polymerized low molecular weight polyol selected from the group consisting of a) polycaprolactone; b) a copolymer of a compound of the formula CH2=C(R)-R1 and allyl alcohol; and c) mixtures thereof; 2) a saturated aliphatic polyol from 4 to 12 carbon atoms or a saturated cycloaliphatic polyol of from 5 to 8 carbon atoms per ring; wherein R is methyl, ethyl or hydrogen; R1 is a group having 6 to 12 carbon atoms containing an aromatic carbocyclic ring; B) a polyisocyanate; wherein the ratio of NCO/OH of A and B ranges from about 0.9 to 1.2; the coating composition having a range of solids content from about 40 to about 100% by weight; and C) a compatible polyurethane catalyst; 2) Applying the coating composition to a substrate; and 3) Heating the coated substrate at a temperature-time range of from about 130°F to about 180°F for a period of time ranging from about 15 minutes to about 60 minutes to achieve a Tukon hardness of at least 3 within 24 hours.

257715

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