Rubber-modified cyanate ester resins and polytriazines derived therefrom
First Claim
Patent Images
1. A rubber-modified cyanate ester resin comprising a major portion of cyanate ester resin and a minor portion of grafted rubber additive which contains:
- 1. resin-insoluble rubber particles;
2. resin-soluble polymer moieties grafted to the resin-insoluble rubber particles; and
3. optionally ungrafted resin-soluble polymer moietieswherein the concentration of grafted rubber additive and the ratio of components is such that;
the concentration of resin-insoluble rubber particles in the rubber-modified cyanate ester resin is at least about 6 weight percent,the concentration of ungrafted resin-soluble polymer in the rubber-modified cyanate ester resin is at most about 10 weight percent,the rubber particles are maintained in a discrete spaced apart relationship to each other, andthe grafted rubber additive and cyanate ester resin can be dispersed in a compatible solvent.
1 Assignment
0 Petitions
Accused Products
Abstract
Polytriazines exhibiting improved toughness without sacrificing heat resistance are prepared by curing a cyanate ester resin having dispersed therein resin-insoluble rubber particles grafted with a resin-soluble polymer. The resin-soluble polymer stabilizes the rubber particles and maintains the particles in an essentially discrete, nonagglomerated form.
12 Citations
35 Claims
-
1. A rubber-modified cyanate ester resin comprising a major portion of cyanate ester resin and a minor portion of grafted rubber additive which contains:
-
1. resin-insoluble rubber particles; 2. resin-soluble polymer moieties grafted to the resin-insoluble rubber particles; and 3. optionally ungrafted resin-soluble polymer moieties wherein the concentration of grafted rubber additive and the ratio of components is such that; the concentration of resin-insoluble rubber particles in the rubber-modified cyanate ester resin is at least about 6 weight percent, the concentration of ungrafted resin-soluble polymer in the rubber-modified cyanate ester resin is at most about 10 weight percent, the rubber particles are maintained in a discrete spaced apart relationship to each other, and the grafted rubber additive and cyanate ester resin can be dispersed in a compatible solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A rubber-modified polytriazine polymer comprising a continuous polytriazine phase and a discontinuous grafted rubber additive phase which contains:
-
1. resin-insoluble rubber particles; 2. resin-soluble polymer moieties grafted to the resin-insoluble rubber particles; and 3. optionally ungrafted resin-soluble polymer moieties wherein the concentration of grafted rubber additive and the ratio of components is such that; the concentration of resin-insoluble rubber particles in the rubber-modified polytriazine is at least about 6 weight percent, the concentration of ungrafted resin-soluble polymer in the rubber-modified polytriazine is at most about 10 weight percent, and the rubber particles are maintained in a discrete spaced apart relationship to each other by the resin-soluble polymer. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
-
-
35. A process for creating a uniform dispersion of grafted rubber additive in cyanate ester resin, said process comprising the steps of:
-
1. contacting a grafted rubber additive, which contains a cross-linked rubber core having grafted thereto a resin-soluble polymer which is compatible with the cyanate ester resin, with an organic solvent, which can form a stable dispersion of the graft rubber additive without dissolving the rubber core or causing substantial swelling of the rubber core and can disperse uniformly with a cyanate ester resin or solution containing cyanate ester resin, under conditions such that a stable dispersion of the grafted rubber additive in the solvent is formed; 2. contacting the stable dispersion from step (1) with a cyanate ester resin and/or an organic solution containing a cyanate ester resin under conditions such that a uniform stable dispersion is formed; and 3. removing the solvent in a manner such that the grafted rubber additive remains uniformly dispersed throughout the cyanate ester resin.
-
Specification