摘要:
The present invention is directed to a RIM process utilizing amine chain-extenders and amines of the formula:
wherein A represents the polyfunctional radical left by the removal of the hydroxyl groups from a polyol of molecular weight of from 62 to 12,000 and functionality n, R represents a hydrocarbon radical, and n is an integer of from 2 to 6. Systems of improved flow are obtained.
摘要:
The present invention is directed to a process for preparing amine terminated compounds by reacting a polyfunctional acetoacetic acid ester with either ammonia or an organic compound which contains one or more primary amino groups in the presence of a solvent and an acidic catalyst selected from the group consisting of (i) boron trifluoride etherate and (ii) organic acids having pKa values of from 0.1 to 0.8, with the proviso that if the primary amino group containing compound contains no aromatically bound amino groups, the pKa of said organic acid is from 0.1 to less than 0.7.
摘要:
Verbesserte Allylurethane sind erhältlich durch Umsetzung eines Polyglykolgemisches mit einer Hydroxyallylverbindung und einem Isocyanat mit wenigstens zwei NCO-Gruppen.
摘要:
Polyurethane/polyurea foams are made by reacting an organic polyisocyanate with resins containing imino/enamino-functional groups in the presence of blowing agents. Control of foam properties is offered by selecting imino/enamino-functional groups which decompose with water at the temperature of the reaction to produce volatile gases.
摘要:
Polyétherpolyols phosphobromés comprenant dans leur molécule des radicaux oxyalkyléniques liés à des atomes de phosphore l'étatde phosphate ou de phosphonate et des radicaux 1,4-dioxy-2,3-dibromo-2-butényléniques dans lesquels le rapport entre le nombre total de radicaux oxyalkyléniques et le nombre total d'atomes de phosphore est égal à 7 au moins. Ces polyétherpolyols sont utilisables comme additifs réactifs ignifugeants dans la fabrication de mousses souples de polyuréthane ignifuges à l'intervention de polyétherpolyols présentant de bonnes propriétés de confort.
摘要:
Improved electron beam curable compounds are prepared by mixing 100 weight parts of (1) polyurethanes prepared from polymeric polyols, organic diisocyanates and polyethers having terminal hydroxyl and unsaturated groups, or terminal hydroxyl and pendant unsaturated groups with (2) 1 to 25 weight parts of an acrylate or alkacrylate terminated polyurethanes prepared by reacting isocyanate terminated prepolymers of hydroxyl terminated polymers with hydroxyl-terminated acrylates or alkacrylates. Compositions of this blend may be crosslinked or cured in a few seconds by electron beam to provide an improved stable coating that can be cured to a variety of hardnesses. These polyurethanes combined with phenoxy resins also form particularly useful binder systems for magnetic tape.
摘要:
The present invention relates to urethane (meth)acrylates comprising residual isocyanate groups which are obtained from the reaction of: a) at least one di- or poly-isocyanate, and b) at least one hydroxyl-functional (meth)acrylic acid ester of at least one polymer chain which comprises: at least one (meth)acryloyl group, at least one free hydroxyl group and at least one polymer chain,
wherein the equivalent ratio of OH groups to NCO groups is 0.05:1 to 0.66:1, a process for preparing thereof and their use in radiation-curable coating composition.