Polymer containing silane groups

Patent metadata

Field	Value
Publication number	US-9790315-B2
Application number	US-201414901492-A
Country	US
Kind code	B2
Filing date	Jul 24, 2014
Priority date	Jul 30, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The invention relates to polymers containing silane groups, to a method for their production and to their use as a component of curable compositions, in particular of moisture-curing sealants, adhesives or coatings that can be applied at ambient temperature, or of hot-melt adhesives containing silane groups. The polymers containing silane groups are obtained in particular by means of a special hydroxysilane which can be produced in particular from the reaction of lactides with aminosilanes.

First claim

The invention claimed is:

1. A polymer having end groups of the formula (I)

where
R 1a is a methyl radical;
R 1b is a hydrogen atom;
R 2 is a hydrogen atom or a monovalent hydrocarbyl radical which has 1 to 12 carbon atoms and optionally contains ether groups, ester groups, nitrile groups, amino groups or silane groups;
R 3 is a linear or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, optionally having aromatic moieties, and optionally having one or more heteroatoms;
R 4 is an alkyl radical having 1 to 8 carbon atoms;
R 5 is an alkyl radical which has 1 to 10 carbon atoms and optionally contains ether groups; and
x is 0, 1 or 2.

2. The polymer as claimed in claim 1 , wherein R 2 is a hydrogen atom or an alkyl radical or a cycloalkyl radical or an alkoxysilyl-alkyl radical.

3. The polymer as claimed in claim 1 , wherein R 3 is selected from the group consisting of 1,3-propylene, 2-methyl-1,3-propylene, 1,4-butylene, 3-methyl-1,4-butylene and 3,3-dimethyl-1,4-butylene.

4. The polymer as claimed in claim 1 , wherein R 5 is a methyl radical or ethyl radical.

5. The polymer as claimed in claim 1 , wherein x is 1 or 0.

6. The polymer as claimed in claim 1 , which has a functionality, based on the end groups of the formula (I), in the range from 1 to 4.

7. The polymer as claimed in claim 1 , which has an average molecular weight in the range from 1,000 to 30,000 g/mol.

8. The polymer as claimed in claim 1 , which is liquid at room temperature and has a majority of polyoxyalkylene units.

9. The polymer as claimed in claim 1 , which is solid at room temperature and has a majority of polyester units and/or polycarbonate units.

10. A process for preparing the polymer as claimed in claim 1 , comprising reacting:
at least one polyol,
at least one diisocyanate,
either at least one lactide of the formula (II) or at least one hydroxy ester of the formula (III), and
at least one aminosilane of the formula (IV) with one another,

where
m is an integer from 1 to 100; and
R 6 is a monovalent hydrocarbyl radical having 1 to 12 carbon atoms.

11. The process as claimed in claim 10 , wherein a hydroxy-silane of the formula (V) is obtained as an intermediate

12. The process as claimed in claim 11 , wherein the hydroxysilane of the formula (V) is prepared using a lactide of the formula (II).

13. A curable composition comprising the polymer as claimed in claim 1 and at least one further constituent.

14. The curable composition as claimed in claim 13 , wherein the curable composition is either a moisture-curing composition applicable at room temperature or a hotmelt adhesive containing silane groups.

15. A process for preparing a polymer having end groups of the formula (I)

where
R 1a and R 1b are each independently a hydrogen atom or a monovalent hydrocarbyl radical having 1 to 12 carbon atoms, or together are an alkylene radical having 2 to 6 carbon atoms;
R 2 is a hydrogen atom or a monovalent hydrocarbyl radical which has 1 to 12 carbon atoms and optionally contains ether groups, ester groups, nitrile groups, amino groups or silane groups;
R 3 is a linear or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, optionally having aromatic moieties, and optionally having one or more heteroatoms;
R 4 is an alkyl radical having 1 to 8 carbon atoms;
R 5 is an alkyl radical which has 1 to 10 carbon atoms and optionally contains ether groups; and
x is 0, 1 or 2,
the method comprising reacting:
at least one polyol,
at least one diisocyanate,
either at least one lactide of the formula (II) or at least one hydroxy ester of the formula (III), and
at least one aminosilane of the formula (IV) with one another,

where
m is an integer from 1 to 100; and
R 6 is a monovalent hydrocarbyl radical having 1 to 12 carbon atoms.

16. The process as claimed in claim 15 , wherein a hydroxy-silane of the formula (V) is obtained as an intermediate

Assignees

• Sika Tech Ag

Inventors

• Kramer Andreas
• Burckhardt Urs
• Stadelmann Ursula

Classifications

• C08G65/336

  containing silicon · CPC title

• C08G18/809

  containing silicon · CPC title

• C08G18/4202

  Two or more polyesters of different physical or chemical nature (C08G18/44 takes precedence) · CPC title

• C08G2170/20

  Compositions for hot melt adhesives · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title