Patent ID: 9725575
Date: 2017-08-08
CPC Classifications: B01J,B29C,C08G,C08J,C08K,C08L

Claim:
1. A microencapsulated curing agent for use in curing a thermosetting resin, the microencapsulated curing agent consisting essentially of: from 15.0 to 70.0 wt. % of an organic peroxide, based on the total microencapsulated curing agent as a whole, and a polyurethane resin encapsulating the organic peroxide, wherein the microencapsulated curing agent is formed by interfacial polymerization between the organic peroxide, xylyene diisocyanate, and a polyethylene glycol having molecular weight of 200 to 20,000, wherein the microencapsulated curing agent, when heated to 100° C. for 30 minutes, exhibits a loss of weight of no greater than 10.0 wt. %, wherein the microencapsulated curing agent when heated to 140° C. for 5 minutes, exhibits a loss of weight of at least 4.0 wt. %, and wherein the microencapsulated curing agent, when heated to 140° C. for 30 seconds, exhibits a loss of weight of no greater than 5.0 wt. %.