Manufacture of thin layers of polyurethane elastomers

Details Manufacture of thin layers of polyurethane elastomers Manufacture of thin layers of polyurethane elastomers

1973-12-04

1977-03-22

Newsome, John H.

Coating processes

Electrical product produced

Welding electrode

427 55, 427385B, 20415919, 260859R, B05D 306

Patent

active

040138062

ABSTRACT:
A process for the manufacture of thin layers based on polyurethane elastomers. A liquid reaction mixture essentially consisting of (A) polyesters, polyethers, polyester urethanes or polyether urethanes, all of which contain at least two hydroxyl groups in the molecule, and diisocyanates or (B) prepolymers obtained from the hydroxyl-containing compounds mentioned under (A) above with an excess of diisocyanates, said prepolymers containing at least two isocyanate groups in the molecule, and at least one of the compounds mentioned under (A) above which are capable of reacting with isocyanates, to which reaction mixture a minor quantity of substantially compatible monomers having at least two photocrosslinkable C--C multiple bonds and optionally a photopolymerization initiator have been added, is applied to a substrate to form a coating thereon, which coating is then gelled by irradiation and finally thermocured. The process of the invention is particularly suitable for the continuous manufacture of uniformly thin layers of soft polyurethane elastomer showing narrow tolerance limits.

REFERENCES:
patent: 2948611 (1960-08-01), Barney
patent: 2965553 (1960-12-01), Dixon et al.
patent: 3008917 (1961-11-01), Park et al.
patent: 3361842 (1968-01-01), Applegath et al.
patent: 3624045 (1971-11-01), Stivers
patent: 3812063 (1974-05-01), Kimura et al.

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