Release films via solventless extrusion processes
Assignee3M Innovative Properties Company
InventorsLarry D. Boardman, Jeffrey O. Emslander, Bryan C. Feisel, David S. Hays, David J. Kinning, Richard L. Peloquin, David J. Yarusso
Life of this patent
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Abstract
Described herein are release layers formed via solventless extrusion. The release layers include a polyolefin and an alkyl dimethicone. The release layers exhibit tailorable release properties from pressure-sensitive adhesives. The release layers are simple to make and require no post-treatment in order to impart the observed release properties. The release layers are adaptable to multilayer extrusion, blown film formation, and cast film formation techniques.
Claims25
A tape construction comprising a tape backing, a pressure sensitive adhesive disposed on the tape backing, and a release layer contacted with the adhesive, the release layer comprising a polyolefin and about 0.5 wt % to 10 wt % of an alkyl dimethicone, the alkyl dimethicone having a structure comprising
- wherein the sum of (a+b+c) is between about 100 and 1000, the ratio of a to the sum of (b+c) is about 98:2 to 94:6, R1 is a linear, branched, or cyclic alkyl group having between 20 and 50 carbon atoms, and R2 is a linear, branched, or cyclic alkyl or alkaryl group having between 6 and 10 carbons.
The tape construction of 14 wherein the substrate is a paper.
A release layer made by the method comprising
- a. forming an alkyl dimethicone by carrying out a first hydrosilylation reaction employing an α-olefin having between 20 and 50 carbon atoms, carrying out a second hydrosilylation reaction employing a strippable α-olefin having between 6 and 10 carbon atoms, and evaporating the unreacted strippable α-olefin, wherein the alkyl dimethicone has a structure corresponding to
- wherein the sum of (a+b+c) is between about 100 and 1000, the ratio of a to the sum of (b+c) is about 98:2 to 96:4, R1 is a linear or branched alkyl group having between 20 and 50 carbons, and R2 is a linear alkyl group having 6 to 10 carbons;
- b. combining a polyolefin with about 0.5 wt % to 10 wt % of the alkyl dimethicone to form a blend;
- and
- c. melt processing the blend to form a release layer,
- wherein the method is characterized by the absence of a post-treatment after melt processing.
A method of making a release layer, the method comprising
- a. forming an alkyl dimethicone by carrying out a first hydrosilylation reaction employing an α-olefin having between 20 and 50 carbon atoms, carrying out a second hydrosilylation reaction employing a strippable α-olefin having between 6 and 10 carbon atoms, and evaporating the unreacted strippable α-olefin, wherein the alkyl dimethicone has a structure corresponding to
- wherein the sum of (a+b+c) is between about 100 and 1000, the ratio of a to the sum of (b+c) is about 98:2 to 96:4, R1 is a linear or branched alkyl group having between 20 and 50 carbons, and R2 is a linear alkyl group having 6 to 10 carbons;
- b. combining a polyolefin with about 0.5 wt % to 10 wt % of the alkyl dimethicone to form a blend;
- and
- c. melt processing the blend to form a release layer,
- wherein the method is characterized by the absence of a post-treatment after melt processing.
Dependencies are inferred from the claim text.