HMPSA incorporating a plasticiser made from a renewable raw material

Patent metadata

Field	Value
Publication number	US-12077692-B2
Application number	US-202017433720-A
Country	US
Kind code	B2
Filing date	Feb 13, 2020
Priority date	Feb 28, 2019
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

1) An HMPSA composition comprising:
from 20% to 50% by weight of a composition of styrene block copolymers; from 35% to 65% by weight of one or more tackifying resins; and from 7% to 25% by weight of a plasticizer consisting of a composition comprising a stand oil of a vegetable oil.

2) A multilayer system comprising:
an adhesive layer (A) consisting of said HMPSA composition; a printable support layer (B) adjacent to the adhesive layer (A); and a nonstick protective layer (C), adjacent to the adhesive layer (A).

3) The use of said multilayer system for the manufacture of self-adhesive articles.

First claim

The invention claimed is:

1. An HMPSA composition which comprises, on the basis of the total weight of said composition:
from 31%-45% by weight of a composition (a1) of styrene block copolymers which comprise at least one elastomer block;
from 40%-55% by weight of one or more tackifying resins (a2); and
from 10%-19% by weight of a plasticizer (a3);
wherein the plasticizer (a3) has a composition (a3) comprising a stand oil (a3-1) of a vegetable oil.

2. The HMPSA composition as claimed in claim 1 , wherein the composition (a1) of styrene block copolymers comprises, on the basis of its total weight:
from 30% to 90% by weight of at least one copolymer selected from the group consisting of SI, SIB, SB, SEB and SEP, and
from 10% to 70% by weight of at least one copolymer selected from the group consisting of SIS, SIBS, SBS, SEBS and SEPS;

wherein the total content of styrene units of said composition (a1) ranges from 10% to 40% by weight on the basis of the total weight of (a1).

3. The HMPSA composition as claimed in claim 1 , wherein the one or more tackifying resins (a2) is selected from the group consisting of:
(i) rosins of natural origin or modified rosins and derivatives of both rosins of natural origin and modified rosins which are hydrogenated, dehydrogenated, dimerized, polymerized or esterified with monoalcohols or polyols;
(ii) resins obtained by hydrogenation, polymerization or copolymerization (with an aromatic hydrocarbon) of mixtures of unsaturated hydrocarbons having 5, 9 or 10 carbon atoms derived from petroleum cuts;
(iii) terpene resins resulting from the polymerization of terpene hydrocarbons in the presence of Friedel-Crafts catalysts, which are optionally modified by the action of phenols; and
(iv) copolymers based on natural terpenes.

4. The HMPSA composition as claimed in claim 1 , wherein the vegetable oil stand oil (a3-1) is obtained by a process comprising a step of heating said vegetable oil in the absence of dioxygen at a temperature above 200° C.

5. The HMPSA composition as claimed in claim 4 , wherein the stand oil (a3-1) has a Brookfield viscosity, measured at 20° ° C., of greater than or equal to 50 mPa·s.

6. The HMPSA composition as claimed in claim 1 , wherein the stand oil (a3-1) is a stand oil of a vegetable oil, wherein the vegetable oil is a composition of triple esters of fatty acids and glycerol, wherein at least 75% of the fatty acids in the triple esters include from 16 to 22 carbon atoms, said proportion being expressed as a percentage by weight on the basis of the total weight of the fatty acids in the triple esters.

7. The HMPSA composition as claimed in claim 1 , wherein the stand oil (a3-1) is a stand oil of a vegetable oil selected from the group consisting of sunflower, rapeseed, linseed and soybean oil.

8. The HMPSA composition as claimed in claim 1 , wherein the plasticizer composition (a3) consists of the stand oil (a3-1).

9. The HMPSA composition as claimed in claim 1 , wherein the plasticizer composition (a3) comprises, in addition to the stand oil (a3-1), a vegetable oil (a3-2) selected from the group consisting of sunflower, rapeseed, linseed and soybean oil, wherein the vegetable oil is a composition of triple esters of fatty acids and glycerol, wherein at least 75% of fatty acids in the triple esters include from 16 to 22 carbon atoms, said percentage being a percentage by weight expressed on the basis of the total weight of the fatty acids in the triple esters.

10. A multilayer system comprising:
an adhesive layer (A) comprising the HMPSA composition as defined in claim 1 ;
a support layer (B) adjacent to the adhesive layer (A); and
a nonstick protective layer (C), adjacent to the adhesive layer (A).

11. The multilayer system as claimed in claim 10 , wherein a thickness of the adhesive layer (A) is strictly greater than 10 μm.

12. The multilayer system as claimed in claim 10 , wherein the multilayer system is packaged in the form of a winding around a reel.

13. The multilayer system as claimed in claim 12 , wherein the protective nonstick layer (C) comprises a silicone-based material coated on a face of the support layer (B) which is opposite a face in contact with the adhesive layer (A).

14. A self-adhesive article comprising the multilayer system as defined in claim 10 .

Assignees

• Bostik Sa

Inventors

• Robert Christophe
• Rafaitin Amandine
• Idttalbe Lahoucine

Classifications

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08K5/0016

  Plasticisers · CPC title

• C08K5/01

  Hydrocarbons {(C08K5/0091 takes precedence)} · CPC title

• C09J153/02 Primary

  Vinyl aromatic monomers and conjugated dienes · CPC title

• C09J11/06

  organic · CPC title