| 主权项 |
1. A pressurized can containing a polymer foam composition for use in one component and two component foams, said polymer foam composition having a cure rate of maximum 3 hours and comprising:
an unsaturated resin present in a concentration of 50 to 90% by weight based on the total composition, and a reactive oligomeric acrylic resin comprising oligomers containing two, three, or more acrylic end groups, said oligomers being prepared by the following steps: (a) preparing a diisocyanate-terminated prepolymer by reacting diisocyanates with oligomers made of a backbone comprising two, three, or more hydroxyl groups; and (b) reacting the obtained diisocyanate-terminated prepolymer with an acrylate or methacrylate to end-cap the reacted diisocyanate and yield said reactive oligomeric acrylic resin,such that the obtained reactive oligomeric acrylic resin comprises oligomers made of a backbone and two, three, or more reacted disocyanates, each coupled to said backbone by a first urethane bond, wherein at least two of said reacted diisocyanates are further coupled to an acrylic group by a second urethane bond, creating the end-capping acrylic groups. |
