Process for the production of an article coated with a crosslink

Details Process for the production of an article coated with a crosslink Process for the production of an article coated with a crosslink

1996-07-18

1998-04-21

Lusignan, Michael

Coating processes

Coating remains adhesive or is intended to be made adhesive

Pressure sensitive adhesive

428345, 428355, 5263171, 52631843, 52631844, B05D 510

Patent

active

057415439

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention describes a process for the preparation of coated articles bearing on at least one surface thereof a crosslinked pressure sensitive adhesive. The crosslinking is accomplished by reaction of unsaturated groups pendent from a polymer backbone. At certain concentrations of monomer, the crosslinkable composition is of a coatable viscosity at or near ambient conditions, and this composition is also described.
2. Background Information
Acrylic pressure sensitive adhesives (PSAs), which exhibit good adherence to high energy (i.e., polar) substrates such as metal and painted steel surfaces and which have good performance properties at high temperatures (i.e., 100.degree. C. or greater), are known in the art. Crosslinking acrylic compositions so as to form crosslinked PSAs is an area of much interest and research.
Solvent-processed acrylic PSA compositions can be crosslinked through the addition of polyfunctional crosslinking agents that react with functionalities within the polymer. See, e.g., Japanese Kokoku No. vapors.
Japanese Kokai No. 411992!-025589 describes a solventless process in which a polymer (obtained by blending and polymerizing an unsaturated monomer comprising a tertiary amino group, an unsaturated monomer comprising a hydroxyl group, and an unsaturated monomer comprising a carboxyl group) is reacted with a polyisocyanate. This process eliminates the need for solvents but requires an additional difficult polymer processing step. Similarly, a difficult polymer blending step is used in Japanese Kokoku .alpha.,.beta.-ethylenically unsaturated monobasic acid is reacted with a copolymer of an .alpha.,.beta.-ethylenically unsaturated monomer and an unsaturated aziridine compound.
The difficulty of additional processing steps, necessary to incorporate polyfunctional crosslinking agents into acrylic PSAs, can be avoided by the use of latent crosslinking reactions. This technique is exemplified in U.S. Pat. No. 4,812,541, where synergistic amounts of an N-vinyl lactam monomer and a glycidyl monomer are incorporated into an acrylate polymer to provide a high performance PSA; however, these latent crosslinked polyacrylates require post-curing that requires additional heat and/or time. Pendent functional group-containing polymers are also described in U.S. Pat. Nos. 4,908,229, 5,122,567, and 5,274,063.
The problems associated with solvent processing and crosslinking bulk-processed acrylate PSAs can be avoided through the use of actinic radiation processing. PSAs made by photopolymerizing an alkyl acrylate and a polar copolymerizable monomer (e.g., acrylic acid, N-vinyl pyrrolidone, etc.) are known in the art. See, e.g., U.S. Pat. Nos. RE 24,906, 4,181,752, 4,364,972, and 4,243,500. The cohesive strength of an acrylic PSA prepared in this manner can be increased if a photoactive crosslinking agent such as an aldehyde, a quinone, or a chromophore-substituted halomethyl-s-triazine is used in conjunction with a photoinitiator. See, e.g., U.S. Pat. Nos. 4,329,384, 4,330,590, 4,391,687, and 5,202,361. However, this type of photocrosslinking process is affected by the thickness of the composition.
The shear value of acrylic PSAs prepared by means of actinic radiation processing can be enhanced through the addition of polyacrylic crosslinking agents. Adhesive compositions crosslinked with a polyacrylic crosslinking agent are described in U.S. Pat. No. 4,379,201. Such adhesives often exhibit good shear properties, but the elastomer is a Type II semi-interpenetrating network that is sensitive to processing conditions. photopolymerizing a mixture prepared from a monomer mixture of alkyl acrylates, the alkyl group of which has 2 to 14 carbon atoms, and a copolymerizable monoethylenically unsaturated monomer having a functional or polar group that controls the glass transition temperature (T.sub.g) of the copolymer; (2) adding to the mixture a photoinitiator, an isocyanate to act as an anchoring force modifier (i.e., the isocyanate group bonds with the s

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