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US 4,054,690 AGranted
Acrylic modified urethane bobbin finish
AssigneeRockwell International Corporation
InventorsWalter C. Webster, III, Frank L. Allen, Jr.
Life of this patent
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Abstract
An improved wood textile bobbin which is provided with two layers of protective coatings, the first layer being made up of ricinoleate diphenyl methane diisocyanate prepolymer (MDI) trifunctional polyether polyol (TPP), and the second layer being composed of MDI, TPP, acrylic copolymer, and to a process for producing such a bobbin.
Claims3
A process for producing an improved wood textile bobbin comprising:
- a. providing a bobbin body which has been dried to less than about 9% moisture;
- b. applying a first protective coating to said bobbin body, which coating consists essentially of from about 20 parts by weight ricinoleate diphyenyl methane diisocyanate propolymer 7-14parts by weight trifunctional polyether polyol, 20-40 parts by weight xylene and 20-40 parts by weight ethylene glycol monoethyl ether acetate;
- c. applying a second protective coating directly to said first protective coating before said first protective coating has cured, said second protective coating consisting essentially of from about 20 parts by weight ricinoleate diphenyl methane diisocyanate prepolymer and 7 to 14 parts by weight trifunctional polyether polyol, 12-27 parts by weight thermoplastic acrylic copolymer, balance substantially all xylene and ethylene glycol moethyl either acetate.
Dependencies are inferred from the claim text.