Methods for making polyurethanes as thin films
First Claim
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1. A method of making a thin film of a polyurethane comprising:
- (a) flash evaporating a solventless monomer mixture that is a combination of a polyol and a polyisocyanate by contact with a heated surface under vacuum to form a vapor;
(b) condensing said monomer mixture onto a substrate under vacuum in a vacuum chamber; and
(c) curing said monomer mixture as said film of said polyurethane.
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Abstract
The present invention is a method of making a thin film of a polyurethane. The method has the steps of: (a) vacuum coating a thin layer of a solventless mixture of a monomer mixture, said monomer mixture selected from the group consisting of polyols, polyisocyanates and combinations thereof, onto a substrate in a vacuum chamber; and (b) curing the monomer as said thin film of said polyurethane.
57 Citations
21 Claims
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1. A method of making a thin film of a polyurethane comprising:
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(a) flash evaporating a solventless monomer mixture that is a combination of a polyol and a polyisocyanate by contact with a heated surface under vacuum to form a vapor;
(b) condensing said monomer mixture onto a substrate under vacuum in a vacuum chamber; and
(c) curing said monomer mixture as said film of said polyurethane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
(a) supplying a continuous liquid flow of the monomer mixture into a vacuum environment at a temperature below both the decomposition temperature and the polymerization temperature of the monomer mixture;
(b) continuously atomizing the monomer mixture into a continuous flow of droplets;
(c) continuously vaporizing the droplets by continuously contacting the droplets on a heated surface having a temperature at or above a boiling point of the liquid monomer mixture, but below the pyrolysis temperature, forming a composite vapor.
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21. A method of making a thin film of a polyurethane comprising:
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(a) flash evaporating a polyol and a polyisocyanate by contact with a heated surface under vacuum to form a vapor;
(b) condensing the vapor onto a substrate under vacuum to form a condensed layer; and
(c) curing the condensed layer as the film of the polyurethane.
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Specification