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US 7,253,241 B2Granted
Fluorochemical containing low adhesion backsize
Assignee3M Innovative Properties Company
InventorsJames P. DiZio, David J. Kinning, George G. I. Moore
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Assignee3M Innovative Properties Company
InventorsJames P. DiZio, David J. Kinning, George G. I. Moore
Estimating the term…
In one aspect, the invention provides a water-based release coating composition comprising a mixture of (A.) from about 5 to about 100 wt % of a polymer comprising the reaction product of (a.) from 1 to about 15 wt % of a fluorinated monomer selected from the group consisting of monomers according to the general formula: RfX—OC(O)—C(R)═CH2, wherein Rf represents a perfluorinated aliphatic group having 3 or 4 carbon atoms, X is an organic divalent linking group, and R represents a hydrogen or methyl group, (b.) from about 40 to about 70 wt % of an alkyl (meth)acrylate, wherein the alkyl group contains from 16 to 22 carbon atoms, (c.) from about 3 to about 20 wt % of (meth)acrylic acid, (d.) from about 20 to about 40 wt % acrylonitrile, and (e.) from 0 to about 15 wt % of vinyl monomer, other than acrylonitrile, wherein the sum of (a.) through (e.) equals 100%; and (B.) from 0 to about 95 wt % of an extender polymer, wherein the sum of (A.) and (B.) is 100% and wt % is based on the total amount of solids in the composition.
A release polymer consisting of the reaction product of
Dependencies are inferred from the claim text.
From the US filing history. Foreign family members aren’t listed.
Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one…:…
With acrylic or methacrylic acids: c13or longer chain acrylate, e.g. stearyl acrylate
Homopolymers or copolymers of esters of monocarboxylic acids: homopolymers or copolymers of vinyl acetate
Of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical: homopolymers or…
Term ended 27 Jul 2025 (estimated)
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The invention relates to release compositions useful in release layers of release articles (e.g., release liners) and adhesive articles (e.g., pressure sensitive adhesive tapes (PSA)).
Polymeric release materials are known to be used in release layers in release articles (e.g., release liners) and adhesive articles (e.g., adhesive tapes) in order to provide a surface from which an adhesive can be easily and cleanly removed. For example, it is known to apply a polymeric release material to the back surface of an adhesive tape (e.g., masking tape) in order to allow the tape to be provided in roll form and to be easily and conveniently dispensed by unwinding the roll. The release coating is expected to reproducibly provide an appropriate unwind force throughout the lifetime of the tape roll, and to not deleteriously affect the adhesive.
The Handbook of Pressure Sensitive Adhesive Technology, 2nd Ed., D. Satas Ed., Van Nostrand Reinhold, N.Y., 1989, Chapter 23, describes polymers which may be used as release agents for PSA tapes. Various polymers of lower critical surface tension such as silicones, fluorine containing polymers, and long alkyl side chain polymers are useful as release coatings. Long alkyl side chain polymers generally contain 16-20 carbon atoms in the alkyl side chains, and can be used to prepare release coatings that provide medium release forces which are especially desirable for PSA tapes. For example, GB 870,022 describes the use of copolymers prepared from octadecyl acrylate, acrylonitrile, acrylic acid, and methyl acrylate for tape release coatings.
As used herein:
“(meth)acrylic or (meth)acrylate” refers to both acrylic or acrylate monomers and methacrylic/methacrylate monomers.
Surprisingly, it has been found that the copolymerization of relatively small amounts of fluorochemical comonomers, having short 3-4 carbon perfluoroalkyl groups, into alkyl (meth)acrylate based release polymers has been found to provide improved holding power to backing without significantly increasing the release force or sacrificing paint wetting or paint flaking resistance. Such release polymers are therefore ideal for use as masking tape release coatings.