Method of using mixed aliphatic/aromatic polycarbodiimides
First Claim
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1. A method of preparing a cross-linkable composition comprising admixing:
- (a) a carboxylated latex,(b) a cross-linking catalyst, and(c) a mixed aliphatic and aromatic polycarbodiimide prepared by a process comprising the following steps seriatim;
(A) charging a mixture of cycloaliphatic or saturated aliphatic mono- and diisocyanates to a reactor with agitation under an inert atmosphere;
(B) heating the resultant mixture to about 120°
to about 160°
C.;
(C) adding a catalytic amount of a phospholene oxide catalyst to the reactor;
(D) feeding a mixture of a non-reactive solvent and aromatic mono- and/or diisocyanate to the reactor; and
(E) maintaining agitation at about 120°
to about 160°
C. until all of the isocyanate functionality is converted to carbodiimide functionality, with the provisos that;
(a) said cycloaliphatic moieties contain 6 to about 10 carbons;
(b) said saturated aliphatic moieties contain from about 4 to about 12 carbons;
(c) said aromatic moieties contain from 6 to about 16 carbons;
(d) the molar ratio of all of the mono-to-diisocyanates ranges from about 2;
1 to about 2;
10; and
(e) the molar ratio of cycloaliphatic and/or saturated aliphatic isocyanate groups to aromatic isocyanate groups ranges from about 0.5;
1 to about 2;
1.
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Abstract
Mixed aliphatic/aromatic polycarbodiimides can be prepared by first heating aliphatic mono- and diisocyanates with a phospholene oxide catalyst and then feeding the aromatic mono and/or diisocyanates in an inert solvent to the reaction mixture. These polycarbodiimides find use in a method for cross-linking carboxylated latexes.
30 Citations
10 Claims
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1. A method of preparing a cross-linkable composition comprising admixing:
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(a) a carboxylated latex, (b) a cross-linking catalyst, and (c) a mixed aliphatic and aromatic polycarbodiimide prepared by a process comprising the following steps seriatim; (A) charging a mixture of cycloaliphatic or saturated aliphatic mono- and diisocyanates to a reactor with agitation under an inert atmosphere; (B) heating the resultant mixture to about 120°
to about 160°
C.;(C) adding a catalytic amount of a phospholene oxide catalyst to the reactor; (D) feeding a mixture of a non-reactive solvent and aromatic mono- and/or diisocyanate to the reactor; and (E) maintaining agitation at about 120°
to about 160°
C. until all of the isocyanate functionality is converted to carbodiimide functionality, with the provisos that;(a) said cycloaliphatic moieties contain 6 to about 10 carbons; (b) said saturated aliphatic moieties contain from about 4 to about 12 carbons; (c) said aromatic moieties contain from 6 to about 16 carbons; (d) the molar ratio of all of the mono-to-diisocyanates ranges from about 2;
1 to about 2;
10; and(e) the molar ratio of cycloaliphatic and/or saturated aliphatic isocyanate groups to aromatic isocyanate groups ranges from about 0.5;
1 to about 2;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification