Hybrid material of crosslinked microgel particles dispersed in an adhesive
First Claim
1. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
- a continuous first phase comprising a pressure sensitive adhesive matrix; and
a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume;
wherein the silicone gel particles do not swell or change shape as a result of being exposed to aqueous solutions,wherein the pressure sensitive adhesive matrix includes an acrylic polymer insoluble in the debonding agent.
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Accused Products
Abstract
A two-phase adhesive composition and selective debonding agent are described. The adhesive composition comprises a substantially continuous first phase comprising a pressure sensitive adhesive and a discontinuous second phase comprising crosslinked silicone gel microparticles. When applied, the selective debonding agent is absorbed by the gel microparticles. The gel microparticles change size or shape and facilitate debonding the adhesive from a substrate by decreasing the contact area between the adhesive and the substrate. Methods to selectively debond pressure sensitive adhesive compositions, methods of making the pressure sensitive adhesive compositions, articles that utilize the pressure sensitive adhesive composition, adhesive systems, and kits that include an article containing the pressure sensitive adhesive composition and the selective debonding agent, are also described.
180 Citations
47 Claims
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1. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume; wherein the silicone gel particles do not swell or change shape as a result of being exposed to aqueous solutions, wherein the pressure sensitive adhesive matrix includes an acrylic polymer insoluble in the debonding agent. - View Dependent Claims (2, 3, 4)
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5. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, wherein the crosslinked silicone gel particles are at least 50% crosslinked. - View Dependent Claims (6)
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7. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, wherein after exposure to the debonding agent, the size of the crosslinked silicone gel particles is between 3 and 20 times the size of the particles prior to exposure to the debonding agent. - View Dependent Claims (8)
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9. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, wherein the proportion of the crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix is at least 1% by weight; wherein after exposure to the debonding agent, the size of the crosslinked silicone gel particles is between 3 and 20 times the size of the particles prior to exposure to the debonding agent.
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10. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, wherein the proportion of the crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix is at least 10% by weight. - View Dependent Claims (11, 12, 13, 14)
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15. A pressure sensitive adhesive composition adapted for selective debonding, the pressure sensitive adhesive composition comprising:
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a continuous first phase comprising a pressure sensitive adhesive matrix; and a discontinuous second phase comprising crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, wherein the pressure sensitive adhesive matrix includes an acrylic polymer insoluble in the debonding agent.
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16. A selectively debondable adhesive system comprising:
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a pressure sensitive adhesive composition including (i) a continuous first phase having a pressure sensitive adhesive matrix, and (ii) a discontinuous second phase having crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a debonding agent, the particles undergo a change in at least one of shape and volume; and a liquid debonding agent. - View Dependent Claims (17, 18)
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19. A method of debonding an article containing a selectively debondable pressure sensitive adhesive composition, the method comprising:
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providing an article containing a selectively debondable pressure sensitive adhesive composition including a continuous first phase having a pressure sensitive matrix and a discontinuous second phase having crosslinked silicone gel particles dispersed in the first phase, in which the article is adhesively bonded to a substrate so the adhesive composition and the substrate contact one another; providing a liquid debonding agent that induces the crosslinked silicone gel particles to undergo at least one of a change in shape from their original shape and an increase in volume, and wherein the debonding agent will not be absorbed by or dissolve the pressure sensitive adhesive; administering an effective amount of the liquid debonding agent to the pressure sensitive adhesive composition, whereby the crosslinked silicone gel particles with in the pressure sensitive adhesive composition undergo at least one of a change in shape and an increase in volume and thereby reduce the adhesion between the pressure sensitive adhesive composition and the substrate; and removing the article containing the pressure sensitive adhesive composition from the substrate. - View Dependent Claims (20, 21)
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22. A selectively debondable article, the article comprising (i) a backing material, the backing material having a first surface and an oppositely directed second surface, and (ii) a pressure sensitive adhesive composition including a continuous first phase of a pressure sensitive adhesive matrix, and a discontinuous second phase having crosslinked silicone gel particles dispersed in the first phase with a characteristic such that upon exposure to a liquid debonding agent, the particles undergo a change in at least one of shape and volume, the pressure sensitive adhesive composition disposed on at least a portion of the first surface of the backing material
wherein the pressure sensitive adhesive matrix includes an acrylic polymer insoluble in the debonding agent.
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40. A kit comprising:
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a backing material having a first surface and an oppositely directed second surface, a pressure sensitive adhesive composition disposed on at least a portion of the first surface of the backing material, the pressure sensitive adhesive composition adapted for selective debonding and including a pressure sensitive adhesive matrix, crosslinked silicone gel particles dispersed in the pressure sensitive adhesive matrix with a characteristic such that upon exposure to a debonding agent, the particles undergo a change in at least one of shape and size; a selective liquid debonding agent for removing the adhesively applied backing material from the surface; and a container retaining the selective debonding agent. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47)
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Specification