Composition for forming a release coating layer
AssigneeNitto Electric Industrial Co., Ltd.
InventorsIsao Mune, Kihachi Suzuki, Toshimitu Okuno
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Abstract
An aqueous composition for forming a release coating layer on a substrate, comprising 100 parts by weight (solids basis) of a mixture of aqueous components of polysiloxanes and from about 20 to 100 parts by weight (solids basis) of an aqueous resin having film-forming ability, wherein the non-volatile content is from about 1 to 60% by weight. The aqueous composition is applied onto a non-permeable substrate to provide a substrate having thereon a release coating layer, which is suitable for use in the production, for example, of a surface protective sheet or tape, and a pressure-sensitive sheet or tape.
Claims11
An aqueous composition for forming a release coating layer on a substrate comprising:
- 100 parts by weight (solids basis) of a mixture of (A) 100 parts by weight (solids basis) of an aqueous component of an organohydrogen polysiloxane containing at least three silicon-bonded hydrogen atoms represented by the formula (I):
- ##STR5## wherein R' is hydrogen or a methyl group, R" is hydrogen, an alkyl, aryl, or alkenyl group, and n is an integer of from 5 to 500, and (B) from about 100 to 2,000 parts by weight (solids basis) of an aqueous component of a diorganopolysiloxane containing a silicon-bonded hydroxy group at both terminals thereof, represented by the formula (II):
- ##STR6## wherein R'" is a univalent hydrocarbon group which may be substituted, and m is an integer of from 100 to 15,000;
- and
- from about 20 to 100 parts by weight (solids basis) of an aqueous resin having a film-forming ability bearing hydroxyl and/or carboxyl functional groups,
- wherein the solids content of the aqueous compositions is from about 1 to 60% by weight.
Dependencies are inferred from the claim text.