Method for producing release liner

Patent metadata

Field	Value
Publication number	US-9394467-B2
Application number	US-201214005915-A
Country	US
Kind code	B2
Filing date	Mar 7, 2012
Priority date	Mar 24, 2011
Publication date	Jul 19, 2016
Grant date	Jul 19, 2016

Abstract

Efficiently produced is a release liner including a plant-derived film as a substrate and having a good appearance, releasability, and adhesion. A method according to the present invention produces a release liner having a plant-derived film substrate and, on at least one side thereof, a release coat layer derived from a thermosetting silicone resin. The method includes the steps as follows:
Step A of applying a thermosetting silicone release agent to at least one side of a plant-derived film substrate, the release agent containing 100 parts by weight of a thermosetting silicone resin and 0.05 to 0.55 part by weight of a curing catalyst; Step B of drying at 40° C. to 90° C. for 10 to 60 seconds after Step A; Step C of applying an ultraviolet ray at 50 to 300 mJ/cm 2 after Step B; and Step D of aging at 30° C. to 70° C. for 12 to 240 hours after Step C.

First claim

The invention claimed is:

1. A method for producing a release liner, the release liner comprising a plant-derived film substrate; and a release coat layer lying on or over at least one side of the film substrate, the release coat layer derived from a thermosetting silicone resin, the method comprising the steps as follows:
Step A of applying a thermosetting silicone release agent to at least one side of a plant-derived film substrate, which comprised at least one selected from the group consisting of a poly(lactic acid) film, a cellulose film, and a polyamide film, to for a coat layer thereon, the thermosetting silicone release agent comprising 100 parts by weight of a thermosetting silicone resin and 0.05 to 0.55 part by weight of a curing catalyst, which comprises a platinum catalyst;
Step B of drying the coat layer after Step A at a temperature of from 40° C. to 90° C. for a duration of from 10 to 60 seconds;
Step C of applying an ultraviolet ray to the coat layer after Step B at a dose of from 50 to 300 mJ/cm 2 ; and
Step D of aging the coat layer after Step C at a temperature of from 30° C. to 70° C. for a duration of 12 to 240 hours.

2. The method for producing a release liner, according to claim 1 , wherein the poly(lactic acid) film is a biaxially stretched poly(lactic acid) film.

3. A release liner comprising a plant-derived film substrate; and a release coat layer lying on or over at least one side of the film substrate, the release coat layer derived from a thermosetting silicone resin, wherein the release liner is produced by the production method of claim 2 .

4. A release liner comprising a plant-derived film substrate; and a release coat layer lying on or over at least one side of the film substrate, the release coat layer derived from a thermosetting silicone resin, wherein the release liner is produced by the production method of claim 1 .

Assignees

• Takahira Hitoshi
• Yoshie Satomi
• Ishiguro Shigeki
• Senda Hiroki
• Nitto Denko Corp

Inventors

• Takahira Hitoshi
• Yoshie Satomi
• Ishiguro Shigeki
• Senda Hiroki

Classifications

• C08J7/0427

  with only one layer of a composition containing a polymer binder (with more layers C08J7/042) · CPC title

• B05D3/0209

  Multistage baking · CPC title

• C09D183/04

  Polysiloxanes · CPC title

• B05D7/04

  to surfaces of films or sheets (producing layered products by applying coatings of pasty or pulverulent plastics B29C41/00) · CPC title

• C09J2483/005

  in the release coating · CPC title