US5539045A
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Aliphatic silylated polyurethane mixtures having reduced viscosites
Assignee: Toray Fine Chemicals Co Ltd
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Filing: 1995-10-27
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Granted: 1996-07-23
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Expires: 2015-10-27
Abstract
Abstract A silylated polyurethane made by the reaction of an isocyanate-terminated polyurethane a mixture of a first and a second alkoxysilane, each of which has the general formula: (CH.sub.3).sub.m (CH.sub.3 O).sub.3-m Si(CH.sub.2).sub.3 XH wherein X is NR, S, oxygen, or a ureido radical, and R is hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, has a lower viscosity than the average of the viscosities of two polyurethanes made from the same isocyanate-terminated polyurethane and either the first alkoxysilane or the second alkoxysilane. Likewise, a blend of those two silylated polyurethanes has a lower viscosity than the viscosity anticipated by the linear viscosity relationship typically observed for blends. Said linear relationship is based on a calculation of the weighted average viscosity of the blend from the viscosity of each component and the proportion of each.
Inventors
- 👤 Keith B. Potts
- 👤 Kanu R. Chokshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:32
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08L; C08L75/00; C08L75/04; C09; C09J; C09J175/00; C09J175/04; C08G2190/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
92 words
A silylated polyurethane mixture having a viscosity less than the weighted average of the viscosities of the constituent silylated-polyurethanes, each constituent polyurethane having the general formula: ##STR3## wherein m and n are independently zero or one, X is NR, S, oxygen, or a ureido radical, R is hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, Y is a urethane residue, and Z is a polyol residue, with the proviso that at least one of m, n, X, or R in a first silylated polyurethane is different than it is in a second silylated polyurethane.
Claim 2
Dependent Claim
92 words
A silylated polyurethane mixture having a viscosity less than the weighted average of the viscosities of the constituent silylated-polyurethanes, each constituent polyurethane having the general formula: ##STR3## wherein m and n are independently zero or one, X is NR, S, oxygen, or a ureido radical, R is hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, Y is a urethane residue, and Z is a polyol residue, with the proviso that at least one of m, n, X, or R in a first silylated polyurethane is different than it is in a second silylated polyurethane.
Claim 3
Dependent Claim
58 words
The mixture of claim 1 wherein a first polyurethane contains a silyl group A and a second polyurethane contains a silyl group B wherein A and B are either the (CH 3 ) m (CH 3 O) 3-m Si(CH 3 ) 3 X-radical or the --X(CH 2 ) 3 Si(OCH 3 ) 3-n (CH 3 ) n radical.
Claim 4
Dependent Claim
39 words
The mixture of claim 1 wherein m and n are zero and X is NR in each of the constituent polyurethanes, and R in one of the constituents is phenyl but is hydrogen in another of the constituent polyurethanes.
Claim 5
Dependent Claim
35 words
The mixture of claim 2 wherein m and n are zero and X is NR in each of the constituent polyurethanes, and R is phenyl in silyl group A and hydrogen in silyl group B.
Claim 6
Dependent Claim
57 words
A polyurethane having the general formula: ##STR4## wherein m and n are independently zero or one, X and X' are independently NR, S, oxygen, or a ureido radical, R is hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, Y is a urethane residue, and Z is a polyol residue, with the proviso that if m=n, X≠X' and if X=X'm≠n.
Claim 7
Dependent Claim
57 words
A polyurethane having the general formula: ##STR4## wherein m and n are independently zero or one, X and X' are independently NR, S, oxygen, or a ureido radical, R is hydrogen, alkyl, aryl, aminoalkyl or trimethoxysilylpropyl, Y is a urethane residue, and Z is a polyol residue, with the proviso that if m=n, X≠X' and if X=X'm≠n.
Claim 8
Dependent Claim
21 words
The polyurethane of claim 5 wherein X is NR and R is phenyl- and X' is NR and R is hydrogen.
Claim 9
Dependent Claim
10 words
A mixture of polyurethanes including the polyurethane of claim 5.
Claim 10
Dependent Claim
10 words
A mixture of polyurethanes including the polyurethane of claim 6.
Claim 11
Dependent Claim
16 words
A sealant composition comprising the polyurethane mixture of claim 1, a filler, and a curing catalyst.
Claim 12
Dependent Claim
15 words
A sealant composition comprising the polyurethane of claim 5, a filler, and a curing catalyst.
Claim 13
Dependent Claim
21 words
The sealant of claim 10 wherein X is NR and R is phenyl- and X' is NR and R is hydrogen.
References Cited (Backward Citations)
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