Self-adhesive article with foam support

Patent metadata

Field	Value
Publication number	US-9493690-B2
Application number	US-201414580699-A
Country	US
Kind code	B2
Filing date	Dec 23, 2014
Priority date	Dec 30, 2013
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

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

The invention claimed is:

1. A 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) a mixture of at least two polymers that are polyurethanes or polyethers with one, two or three mono-, di- or tri-alkoxysilane terminal groups, said mixture comprising at least one polymer corresponding to one of formulae (Ia), (IIa), (IIIa) or (IVa), and at least one polymer corresponding to one of formulae (I), (II), (III) or (IV),

it being understood that
when a polymer with two or three monoalkoxysilane terminal groups 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 mono-, di- or tri-alkoxysilane terminal group 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 trialkoxysilane terminal groups, 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 dialkoxysilane terminal groups, 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 monoalkoxysilane terminal groups, 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 mono-, di- and/or trialkoxysilane terminal group, with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer and corresponding to the following formula:

and wherein Formulae (I)-(IV) are

wherein in formulae (Ia), (IIa), (IIIa) and (IVa) and 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 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. The self-adhesive article according to claim 1 , wherein the support layer has a Young's modulus less than or equal to 300 MPa.

3. The self-adhesive article according to claim 1 , wherein the support layer is in the form of a foam.

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

5. The 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 a mixture of polymers such as defined in claim 1 ,
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.

6. The 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:
(i) resins able to be obtained by polymerization of terpene hydrocarbons and phenols, in the presence of Friedel-Crafts catalysts,
(ii) resins able to be obtained by polymerization of alpha-methyl styrene,
(i) rosins of natural or modified origin;
(iv) resins obtained by hydrogenation, polymerization or copolymerization of mixtures of unsaturated aliphatic hydrocarbons having approximately 5, 9 or 10 carbon atoms, originating from petroleum cuts,
(v) terpene resins generally resulting from the polymerisation of terpene hydrocarbons in the presence of Friedel-Crafts catalysts,
(vi) copolymers based on natural terpenes, or
(vii) acrylic resins.

7. A mixture of polymers suitable for use in an adhesive composition, said mixture comprising at least two polymers belonging to 2 different groups P1, P2, P3 or P4, said mixture comprising at least one polymer corresponding to one of formulae (Ia), (IIa), (IIIa) and (IVa) and with a quantity of silyl functions less than or equal to 0.480 meq/g of polymer,
it being understood that:

wherein
B represents one of the two formulae below:

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 at

Assignees

• Bostik Sa

Inventors

• Goubard David
• Laferte Olivier
• Troadec Herveline

Classifications

• C09J2400/243

  in the substrate · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• Y10T428/2896

  including nitrogen containing condensation polymer [e.g., polyurethane, polyisocyanate, etc.] · 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

• C09J7/26

  Porous or cellular plastics · CPC title