Self-adhesive article with foam support

Patent metadata

Field	Value
Publication number	US-2017058166-A1
Application number	US-201615348739-A
Country	US
Kind code	A1
Filing date	Nov 10, 2016
Priority date	Dec 30, 2013
Publication date	Mar 2, 2017
Grant date	—

Abstract

The present invention relates to a self-adhesive article comprising a support layer of foam or similar type and an adhesive layer obtained by cross-linking an adhesive composition. The present invention also relates to a mixture of at least two polymers suitable for use for the manufacture of the self-adhesive article as well as an adhesive composition comprising said mixture of at least two polymers according to the invention.

First claim

1 . Self-adhesive article comprising a support layer coated with an adhesive layer, said support layer having an elongation at break ranging from 50 to 1200% and a bulk density ranging from 25 to 1200 kg/m 3 , said adhesive layer is obtained by cross-linking an adhesive composition comprising:
a) at least one polymer of formula (Ia) or at least one polymer of formula (IIa) or a mixture of at least two polymers chosen from polyurethanes and polyethers with one, two or three terminal groups of mono-, di- or tri-alkoxysilane type, said mixture comprising at least one polymer corresponding to one of formulae (Ia), (IIa), (IIIa) and (IVa),
it being understood that
when a polymer with two or three terminal groups of monoalkoxysilane type is present, said mixture comprises up to 15% by weight, with respect to the total weight of the mixture, of said polymer,
when a polymer with one terminal group of mono-, di- or tri-alkoxysilane type is present, said mixture comprises up to 15% by weight, with respect to the total weight of the mixture, of said polymer,
b) at least one tackifier resin, and
c) at least one cross-linking catalyst;

wherein:
the polymer of formula (Ia) is a polyurethane or a polyether comprising two or three hydrolysable terminal groups of trialkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

the polymer of formula (IIa) is a polyurethane or a polyether comprising two or three hydrolysable terminal groups of dialkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

the polymer of formula (IIIa) is a polyurethane or a polyether comprising two or three hydrolyzable terminal groups of monoalkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

the polymer of formula (IVa) is a polyurethane or a polyether comprising one hydrolysable terminal group of mono-, di- and/or trialkoxysilane type, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

in formulae (Ia), (IIa), (IIIa) and (IVa) above,
B represents one of the two formulae below:

where D and T represent a hydrocarbon radical comprising 2 to 66 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,

R 1 represents a divalent hydrocarbon radical comprising 5 to 15 carbon atoms which can be aromatic or aliphatic, linear, branched or cyclic,
R 3 represents a linear or branched divalent alkylene radical comprising 1 to 6 carbon atoms,
R 2 represents a linear or branched divalent alkylene radical comprising 2 to 4 carbon atoms,
R 4 and R 5 , identical or different, each represent a linear or branched alkyl radical comprising 1 to 4 carbon atoms, R 4 optionally being able to be part of a ring,
R 6 represents a hydrocarbon radical comprising 1 to 22 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,
R 7 represents a hydrogen atom, a phenyl radical or a linear, branched or cyclic alkyl radical comprising 1 to 10 carbon atoms,
n is an integer such that the average molar mass of the polyether block of formula —[OR 2 ] n — ranges from 300 g/mol to 40000 g/mol,
m is an integer such that the average molar mass of the polymer ranges from 600 g/mole to 100000 g/mole,
p is an integer equal to 0, 1 or 2.
f is an integer equal to 2 or 3.

2 . Self-adhesive article according to claim 1 , wherein the mixture of at least two polymers comprises:
at least one polymer corresponding to one of formulae (Ia), (IIa), (IIIa) or (IVa) described in claim 1 , and at least one polymer corresponding to one of formulae (I), (II), (III) or (IV) below:

it being understood that:
when a polymer of formula (IIIa) and/or (III) is present, said mixture comprises up to 15% by weight of polymer of formula (IIIa) and/or (II), with respect to the total weight of the mixture of polymers,
when a polymer of formula (IVa) and/or (IV) is present, said mixture comprises up to 15% by weight of polymer of formula (IVa) and/or (IV), with respect to the total weight of the mixture of polymers;

in formulae (I) (II), (III), and (IV) above:
B represents one of the two formulae below:

where D and T represent a hydrocarbon radical comprising 2 to 66 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,

R 1 represents a divalent hydrocarbon radical comprising 5 to 15 carbon atoms which can be aromatic or aliphatic, linear, branched or cyclic,
R 3 represents a linear or branched divalent alkylene radical comprising 1 to 6 carbon atoms,
R 2 represents a linear or branched divalent alkylene radical comprising 2 to 4 carbon atoms,
R 4 and R 5 , identical or different, each represent a linear or branched alkyl radical comprising 1 to 4 carbon atoms, R 4 optionally being able to be part of a ring,
R 6 represents a hydrocarbon radical comprising 1 to 22 carbon atoms, linear, branched, cyclic, alicyclic or aromatic, saturated or unsaturated, optionally comprising one or more heteroatoms,
n is an integer such that the average molar mass of the polyether block of formula —[OR 2 ] n — ranges from 300 g/mol to 40000 g/mol,
m is an integer such that the average molar mass of the polymer ranges from 600 g/mol to 100000 g/mol,
p is an integer equal to 0, 1 or 2.
f is an integer equal to 2 or 3.

3 . Self-adhesive article according to claim 1 , wherein the support layer has a Young's modulus less than or equal to 300 MPa.

4 . Self-adhesive article according to claim 1 , wherein the support layer is in the form of a foam.

5 . Self-adhesive article according to claim 1 , wherein the support layer is presented in the form of one or more polymeric layers.

6 . Self-adhesive article according to claim 1 , wherein the adhesive composition comprises:
from 20 to 85% by weight, with respect to the total weight of the adhesive composition, of at least one polymer or a mixture of polymers, from 15 to 80% by weight, with respect to the total weight of the adhesive composition, of at least one tackifier resin, from 0.01 to 3% by weight, with respect to the total weight of the adhesive composition, of at least one cross-linking catalyst.

7 . Self-adhesive article according to claim 1 , wherein the tackifier resin has a number-average molar mass ranging from 100 Da to 5 kDa and is chosen from:
(i) resins able to be obtained by polymerization of terpene hydrocarbons and phenols, in the presence of

Assignees

• Bostik Sa

Inventors

• Goubard David
• Laferte Olivier
• Troadec Herveline

Classifications

• C09J201/06

  containing oxygen atoms {(C09J201/025 takes precedence)} · CPC title

• C09J2475/00

  Presence of polyurethane · CPC title

• C08G18/5096

  containing silicon · CPC title

• C08G18/755

  and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate · CPC title

• C08G18/10

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