US 5,693,738 A · Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens

Abstract

A composition for a urethane-base plastic lens, comprising: (a) at least one ester compound selected from the group consisting of isocyanate compounds, isothiocyanate compounds and isocyanato-containing isothiocyanate compounds, (b) at least one active hydrogen compound selected from the group consisting of hydroxyl compounds, mercapto compounds and mercapto-containing hydroxyl compounds, (c) a tertiary amine, and (d) a Lewis acid; a plastic lens obtained by heating and curing the composition, and a process for the production of the plastic lens. The composition has a long pot life and can produce an optically uniform plastic lens in a short time.

Claims18

Dependent claims

A composition for a urethane-based plastic lens, comprising:

(a) at least one compound selected from the group consisting of isocyanate compounds, isothiocyanate compounds and isocyanato-containing isothiocyanate compounds;
(b) at least one active hydrogen compound selected from the group consisting of hydroxyl compounds, mercapto compounds and mercapto-containing hydroxyl compounds;
(c) a tertiary amine having no electron attractive group;
and
(d) a Lewis acid which is capable of forming a complex or salt with the tertiary amine with the proviso that the Lewis acid is not dibutyltin dilaurate, dibutyltin diacetate or stannous octoate.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/413,113Filed 29 Mar 1995

Priority

JP 6-0703478 Apr 1994

Granted

2 Dec 1997

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

C08G 18/3876
Having sulfur: containing mercapto groups
C08G 18/1875
Containing secondary or tertiary amines or salts thereof: containing ammonium salts or mixtures of secondary of tertiary amines and acids
C08G 18/3203
Polyhydroxy compounds; Polyamines; Hydroxyamines: polyhydroxy compounds
C08G 18/3868
Containing groups having one sulfur atom between two carbon atoms: the sulfur atom belonging to a sulfide group

Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens

Life of this patent

Composition for urethane-base plastic lens, urethane-base plastic lens obtained from the composition, and process for the production of the plastic lens

Life of this patent

Abstract

Claims18