US 2019/0169352 A1 · PROCESS FOR THE SYNTHESIS OF SILYLATED POLYURETHANES AND SILYLATED POLYURETHANE COMPOSITION

Abstract

The present invention provides a process for the synthesis of silylated polyurethanes, comprising three sequential steps, a step (i) of preparing NCO-terminated polyurethane, a step (ii) of partial grafting of the NCO functions with silane functions and a step (iii) of total grafting of the residual NCO functions with functions that react with the NCO functions by means of polyfunctional compounds. The present invention also provides a silylated polyurethane composition that can be obtained by means of the process according to the invention, an adhesive composition comprising said silylated polyurethane composition and a self-adhesive item obtained from the adhesive composition according to the invention.

Claims16

Dependent claims

1-15. (canceled)

A process for the synthesis of a composition of silylated polyurethanes (A), said process comprising the following sequential stages:

i. polyaddition of at least one polyol (B) with at least one diisocyanate (C), in which the ratio (r1) of the number of NCO functional groups to the total number of OH functional groups, and of NH and NH2 functional groups optionally present, is strictly greater than 1;
ii. reacting the composition obtained in stage (i) with at least one silane (E) selected from the group consisting of aminosilanes (E1) and mercaptosilanes (E2), in which the ratio (r2) of the number of NCO functional groups to the number of amine and/or thiol functional groups is strictly greater than 1;
iii. reacting the composition resulting from stage (ii) with at least one compound (G) comprising at least two identical or different functional groups selected from the group consisting of alcohol, primary amine, secondary amine and thiol functional groups, in which the ratio (r3) of the number of NCO functional groups to the number of alcohol, primary amine, secondary amine and thiol functional groups is less than or equal to 1.

A composition of silylated polyurethanes (A) comprising a first type of silylated polyurethane (A1) of formula (I) and a second type of silylated polyurethane (A2) of formula (IIa), (IIb) or (IIc):

wherein formulae:
Jg represents a group of type:
Lg represents a group of type:
Mg represents a group of type:
Jd represents a group of type:
Ld represents a group of type:
Md represents a group of type:
R1 represents a divalent hydrocarbon radical comprising from 5 to 15 carbon atoms which can be aromatic or aliphatic and linear, branched or cyclic,
R3 represents a linear or branched divalent alkylene radical comprising from 1 to 6 carbon atoms,
R2 represents a divalent hydrocarbon radical optionally comprising one or more heteroatoms,
R4 and R5, which are identical or different, each represent a linear or branched alkyl radical comprising from 1 to 4 carbon atoms;
two —OR5 groups can optionally be involved in one and the same ring,
X represents a divalent radical chosen from —NH—, —NR7— or —S—,
R7 represents a linear, branched or cyclic alkyl radical having from 1 to 12 carbon atoms or an alkenyl radical having from 2 to 12 carbon atoms or an aryl radical having from 6 to 12 carbon atoms,
R6 represents a divalent radical, a trivalent radical or a tetravalent radical chosen from polysiloxane radicals and from hydrocarbon radicals optionally comprising one or more carbonyl (C═O) functional groups and optionally one or more heteroatoms,
A, A′, A″ and A′″ represent, independently of one another, an oxygen atom, a sulfur atom, a divalent —NH— radical or a divalent —NR8— radical,
R8 represents a linear, branched or cyclic alkyl radical comprising from 1 to 18 carbon atoms,
n is an integer greater than or equal to 1 such that the polyurethane (A1) exhibits a number-average molecular weight Mn(1) ranging from 800 to 100 000 daltons,
m is an integer greater than or equal to 1 such that the polyurethane (A2) exhibits a number-average molecular weight Mn(2) such that the ratio Mn(2)/Mn(1) is greater than or equal to 2.0, and
p is an integer equal to 0, 1 or 2.

17 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/323,612Filed 1 Aug 2017

Priority

FR 16576438 Aug 2016

Published

6 Jun 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification21 codes

C08G 18/3893
Having heteroatoms other than oxygen: containing silicon
C08G 18/10
Processes: prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
C08G 18/222
Containing metal compounds: metal compounds not provided for in groups C08G18/225 - C08G18/26
C08G 18/227
Containing metal compounds: of antimony, bismuth or arsenic

Process for the synthesis of silylated polyurethanes and silylated polyurethane composition

Life of this patent

Process for the synthesis of silylated polyurethanes and silylated polyurethane composition

Life of this patent

Abstract

Claims16