Dual cure composite resins containing uretdione and unsaturated sites
AssigneeCovestro LLC
InventorsCharles Todd Williams, Joseph Pierce, David Zielinski
Life of this patent
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Abstract
The present invention provides a dual-cure composition containing multifunctional polyols, uretidiones, peroxide curable monomers containing unsaturation and crosslinking agents. The dual-cure composition may be used to form a high modulus material useful as the matrix in a prepreg material and in composites. The present invention also relates to methods for the production of the dual-cure composition, prepreg materials comprising the dual-cure composition and a fibrous support, and composites made from the prepreg material.
Claims9
A process for the production of a dual-cure composite comprising:
- homogenizing a pre-polymer composition comprising:
- (A) a multifunctional polyol;
- (B) a curing agent containing uretdione groups;
- (C) a low viscosity unsaturated reactive diluent;
- (ii) heating the pre-polymer composition to a temperature above the Tg of said component (B);
- (iii) cooling the heated pre-polymer composition to a temperature of less than 110° C.;
- (iv) mixing the cooled pre-polymer composition with a dual-cure catalyst composition to form a dual-cure composition, the catalyst composition comprising:
- (D) at least one reactively activatable catalyst;
- and
- (E) a thermal crosslinking initiator;
- (v) curing the dual-cure composition at a temperature of from 80° C. to 130° C. for a period of time sufficient to form a cured composite.
A prepreg material comprising:
- (i) at least one fibrous material support, and
- (ii) a dual-cure composition comprising:
- (A) a multifunctional polyol;
- (B) a curing agent containing uretdione groups;
- (C) a low viscosity unsaturated reactive diluent;
- (D) at least one reactively activatable catalyst;
- and
- (E) a thermal crosslinking initiator.
Dependencies are inferred from the claim text.