C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
117/113, 402/133
C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/80 (2006.01) C09K 3/10 (2006.01)
Patent
CA 1234246
ABSTRACT OF THE DISCLOSURE There is disclosed a one-package solventless polyurethane resin sealant composition curable to a Shore "S" hardness of at least 60-65 by heating at 250°F. for about 30 minutes, or at higher temperatures for shorter times. The composition comprises a polyurethane prepolymer having terminal isocyanate groups, all of which are blocked by reaction with an oxime. The prepolymer is prepared by reacting an excess of an aliphatic, cycloaliphatic, arali- phatic, or aromatic polyisocyanate with at least one polyol reagent selected from the group consisting of polyether polyols and polyester polyols to give an isocyanate terminat- ed prepolymer having a molecular weight between about 3,000 and 6,000 and then blocking the isocyanate groups thereof by reaction with an oxime. The composition also comprises a polyol curing agent having at least two active hydrogen atoms per molecule and at least one filler suitable for use in elastomeric compositions.
474146
Hsieh Harry W.s.
Rizk Sidky D.
Essex Specialty Products Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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