Pressure sensitive adhesive with butene-1 copolymers

Patent metadata

Field	Value
Publication number	US-9284475-B2
Application number	US-201113880403-A
Country	US
Kind code	B2
Filing date	Oct 18, 2011
Priority date	Oct 21, 2010
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

Pressure sensitive adhesive composition and multilayer easy peel re-closable structures thereof, comprising a butene-1 (co)polymer (A) having a content of butene-1 derived units of 80 wt % or more; a flexural modulus (MEF) of 80 MPa or less; a melting temperature DSC (TmI) lower than 110° C., and optionally a tackifier (B).

First claim

The invention claimed is:

1. A pressure-sensitive adhesive comprising:
(A) a butene-1 copolymer having:
(i) a content of butene-1 derived units of 80 wt. % or more, based upon the total weight of the butene-1 copolymer,
(ii) a flexural modulus (MEF) of 80 MPa or less,
(iii) a melting temperature DSC (TmI) lower than 50° C.; and optionally

(B) a tackifier.

2. The pressure-sensitive adhesive according to claim 1 comprising:
(A) 60-95 wt. % of the butane-1 copolymer, based upon the total weight of the pressure-sensitive adhesive; and
(B) 5-40 wt. % of the tackifier, based upon the total weight of the pressure-sensitive adhesive.

3. The pressure-sensitive adhesive according to claim 1 , wherein the copolymer (A) has crystallinity of less than 40% measured via X-ray.

4. The pressure-sensitive adhesive according to claim 1 , wherein the butene-1 copolymer has hardness shore A lower than 90.

5. The pressure-sensitive adhesive according to claim 1 , wherein the tackifier is a hydrogenated hydrocarbon resin.

6. The pressure-sensitive adhesive according to claim 1 , wherein the copolymer (A) is selected from the group consisting of:
(A1) a butene-1 copolymer comprising from 10 to 50% isotactic pentads, and
(A2) a butene-1/ethylene copolymer or a butene-1/ethylene/propylene terpolymer having a (Mw/Mn) measured by GPC lower than 3.

7. The pressure-sensitive adhesive according to claim 1 , wherein the pressure-sensitive is in contact with
(i) a sealing outer layer made of a polyethylene homo or copolymer of polyethylene with other C3-C10 alpha-olefins having a melt index from 0.1 to 8 g/10 min measured at 190° C. with a load of 2.16 kg, and having a density from 0.916 to 0.935 g/cm 3 ; and
(ii) an outer support layer made of a propylene homopolymer or copolymer of propylene with ethylene or with other C4-C 10 alpha-olefins, having a melt index from 0.5 to 15 g/10 min, measured at 230 ° C. with a load of 2.16 kg, and having a density from 0.880 to 0.910 g/cm 3 .

Assignees

• Musacchi Gianluca
• Roucourt Inge Elisabeth
• Pellegatti Giampaolo
• De Clippeleir Johan
• Spataro Stefano
• Basell Poliolefine Srl

Inventors

• Musacchi Gianluca
• Roucourt Inge Elisabeth
• Pellegatti Giampaolo
• De Clippeleir Johan
• Spataro Stefano

Classifications

• Y10T428/1452

  Polymer derived only from ethylenically unsaturated monomer · CPC title

• C08L57/02

  Copolymers of mineral oil hydrocarbons · CPC title

• C09J123/20 Primary

  having four to nine carbon atoms · CPC title

• C09J7/38

  Pressure-sensitive adhesives [PSA] · CPC title

• C08L2666/04

  Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof · CPC title