Sheet material

• US 6,348,249 B2
• Filed: 03/08/2001
• Issued: 02/19/2002
• Est. Priority Date: 01/31/1994
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Meyer, Scott R.
• Primary Examiner(s): Ahmad, Nasser
• Application Number:
  US09/802,243
• Publication Number:
  US 20010009706A1
• Time in Patent Office: 348 Days
• Field of Search: 428/40.1, 428/41.3, 428/41.5, 428/41.7, 428/41.8, 428/218, 428/219, 428/220, 428/343, 428/352, 428/354, 428/355, 428/516, 428/517, 428/518, 428/906, 156/244.11
• US Class Current: 428/41.8
• CPC Class Codes: B60J 10/15 characterised by the material
• CPC Class Codes: B62D 25/2072 Floor protection, e.g. from corrosion or scratching floor mats B60N3/04, armour F41H7/042, insulation B60R13/08, streamlining B62D35/02
• CPC Class Codes: C08F 220/10 Esters
• CPC Class Codes: C08F 283/10 on to polymers containing more than one epoxy radical per molecule C08F283/004 takes precedence
• CPC Class Codes: C09J 2301/1242 the opposite adhesive layers being different
• CPC Class Codes: C09J 7/10 without carriers
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/35 Heat-activated
• CPC Class Codes: Y10S 428/906 Roll or coil
• CPC Class Codes: Y10T 428/14 Layer or component removable to expose adhesive
• CPC Class Codes: Y10T 428/1452 Polymer derived only from ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/1462 Polymer derived from material having at least one acrylic or alkacrylic group or the nitrile or amide derivative thereof [e.g., acrylamide, acrylate ester, etc.]
• CPC Class Codes: Y10T 428/1471 Protective layer
• CPC Class Codes: Y10T 428/1476 Release layer
• CPC Class Codes: Y10T 428/24992 Density or compression of components
• CPC Class Codes: Y10T 428/28 Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2839 with release or antistick coating
• CPC Class Codes: Y10T 428/2848 Three or more layers
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer
• CPC Class Codes: Y10T 428/31917 Next to polyene polymer
• CPC Class Codes: Y10T 428/3192 : Next to vinyl or vinylidene chloride polymer

Abstract

A sheet material comprising i) a pressure-sensitive adhesive film comprising an acrylic pressure-sensitive adhesive polymer, and ii) a release film comprising a polyolefin polymer having a density of no greater than 0.90 g/cc, the pressure-sensitive adhesive film being in contact with the polyolefin polymer.

Claims

1. A sheet material comprising i) a pressure-sensitive adhesive film comprising an acrylate-based pressure-sensitive adhesive polymer;

and ii) a release film comprising a first layer comprising a polyolefin polymer having a density of no greater than 0.90 g/cc and a CDBI of greater than about 70 percent, said pressure-sensitive adhesive film being in contact with said first layer of said release film.

2. A sheet material according to claim 1, wherein said polyolefin polymer has a density of no greater than 0.89 g/cc.

3. A sheet material according to claim 1, wherein said polyolefin polymer has a density of no greater than 0.88 g/cc.

4. A sheet material according to claim 1, wherein said polyolefin polymer is a copolymer of ethylene and at least one other monomer which is an alpha-olefin.

5. A sheet material according to claim 4, wherein said alpha-olefin is butene-1.

6. A sheet material according to claim 1, wherein said first layer is substantially free of a polyethylene polymer having a density of 0.91 g/cc or greater.

7. A sheet material according to claim 1, wherein said first layer consists essentially of said polyolefin polymer.

8. A sheet material according to claim 1, substantially free of a silicone release coating.

9. A sheet material according to claim 1, wherein said release film further comprises a second layer comprising a polybutylene polymer.

10. A sheet material according to claim 9, wherein said first layer and said second layer of said release film are coextruded.

11. A sheet material according to claim 1, in the form of a convolutely wound roll.

12. A sheet material according to claim 1, wherein said release film further comprises a second layer comprising a polybutylene homopolymer or a polybutylene copolymer comprising no more than about 5% by weight of a comonomer.