US12077694B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12077694-B2 |
| Application number | US-201917277362-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 27, 2019 |
| Priority date | Sep 28, 2018 |
| Publication date | Sep 3, 2024 |
| Grant date | Sep 3, 2024 |
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Official abstract text for this publication.
A surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc is provided. The surface-protective PSA sheet capable of reducing adherend damage and well maintaining appearance, etc., comprises a surface layer, a resin substrate layer and a PSA layer, and has a multilayer structure with the resin substrate layer placed between the surface layer and the PSA layer, wherein the surface layer is a layer obtainable by curing a heat-curable composition comprising the following components: (a) a hydroxyl group-containing (meth)acrylic copolymer having a glass transition temperature of −40° C. to 30° C.; (b) an allophanate polyisocyanate and/or a biuret polyisocyanate; and (c) a polysiloxane comprising a hydroxyl group-containing hydrocarbon group and/or polymer.
Opening claim text (preview).
The invention claimed is: 1. A surface-protective pressure-sensitive adhesive sheet comprising a surface layer, a resin substrate layer and a pressure-sensitive adhesive layer, and having a multilayer structure with the resin substrate layer placed between the surface layer and the pressure-sensitive adhesive layer, wherein the surface layer is a layer obtained by curing a heat-curable composition that comprises the following components: (a) a hydroxyl group-containing (meth)acrylic copolymer having a glass transition temperature of −40° C. or higher and −22° C. or lower; (b) an allophanate polyisocyanate and/or a biuret polyisocyanate; (c) a polysiloxane comprising a hydroxyl group-containing hydrocarbon group and/or polymer; and (d) a diol having a hydroxyl value of 200 mgKOH/g or higher and a molecular weight of 500 or lower. 2. The surface-protective pressure-sensitive adhesive sheet according to claim 1 , wherein the resin substrate layer comprises a thermoplastic elastomer. 3. The surface-protective pressure-sensitive adhesive sheet according to claim 1 , wherein the (meth)acrylic copolymer has a hydroxyl value of 10 mgKOH/g to 150 mgKOH/g based on non-volatiles. 4. The surface-protective pressure-sensitive adhesive sheet according to claim 1 , wherein the heat-curable composition has a component (a) to component (b) mass ratio (component (a)/component (b)) of 0.2 to 5.0.
Presence of polysiloxane · CPC title
Presence of polyurethane · CPC title
Presence of (meth)acrylic polymer · CPC title
for protecting painted surfaces, e.g. of cars · CPC title
Compositions for adhesives · CPC title
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