Strippable pressure-sensitive adhesive and adhesive material using the same
AssigneeNitto Denko Corporation
InventorsKaoru Aizawa, Michirou Kawanishi
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Abstract
A strippable pressure-sensitive adhesive and an adhesive material using the same are disclosed, adhesive comprising a highly elastic base polymer whose dynamic modulus of elasticity is in the range of from 250,000 to 10,000,000 dyne/cm.sup.2 at a temperature between ambient temperature and 150.degree. C. with a small rate of change with temperature, having incorporated therein a blowing agent, which adhesive reduces or loses its adhesiveness on expansion or blowing of blowing agent. The adhesive and adhesive material are easily re-applied, is capable of satisfactorily following the shape of an adherent during forming of the adherent, reduces its adhesiveness on heating, and is applicable to various adherents with excellent workability.
Claims19
A strippable pressure-sensitive adhesive, comprising:
- a highly elastic base polymer whose dynamic modulus of elasticity is in the range of from 250,000 to 10,000,000 dyne/cm.sup.2 at a temperature between ambient temperature and 150.degree. C., said base polymer having incorporated therein a blowing agent, wherein the adhesive reduces or loses its adhesiveness on expansion or blowing of said blowing agent, and wherein said blowing agent is heat-expandable fine particles, the heat-expandable fine particles comprising first particles and second particles, said first particles having an average particle diameter of less than or equal to 7 .mu.m, and said second particles having an average particle diameter of greater than or equal to 10 .mu.m, wherein said first particles are present in an amount of between about 1 and about 50 weight percent based on the weight of the sum of the first and second particles.
An adhesive material, comprising:
- a support having on at least one side thereof a strippable pressure-sensitive adhesive layer comprising a highly elastic base polymer whose dynamic modulus of elasticity is in the range of from 250,000 to 10,000,000 dyne/cm.sup.2 at a temperature between ambient temperature and 150.degree. C., said base polymer having incorporated therein a blowing agent, wherein the adhesive layer reduces or loses its adhesiveness on expansion or blowing of said blowing agent, and wherein said blowing agent is heat-expandable fine particles, the heat-expandable fine particles comprising first particles and second particles, said first particles having an average particle diameter of less than or equal to 7 .mu.m, and said second particles having an average particle diameter of greater than or equal to 10 .mu.m, wherein said first particles are present in an amount of between about 1 and about 50 weight percent based on the weight of the sum of the first and second particles.
Dependencies are inferred from the claim text.