초록 ▼

A coated bonding tape having improved peel strength combined with low temperature flexibility is disclosed in which a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer is coated with a pressure-sensitive adhesive coating and in which the elastome

A coated bonding tape having improved peel strength combined with low temperature flexibility is disclosed in which a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer is coated with a pressure-sensitive adhesive coating and in which the elastomer layer consists essentially of butyl rubbers, pigment and sufficient plasticizer for the elastomer to provide a half thickness reduction at a pressure below 800 psi. At least about 45% of the butyl rubber is cross-linked, at least about 20% of the butyl rubber is noncross-linked and has an average molecular weight of at least about 250,000, and at least about 60% of the pigment is of reinforcing character, the proportion of plasticizer providing a tape body having a strength of at least about 30 psi before plastic flow begins, and the pressure-sensitive adhesive coating is selected to provide a bond to the tape body which is strong enough to force the bonding tape to fail cohesively when peeled from a substrate.

대표청구항 ▼

A coated bonding tape having improved peel strength combined with low temperature flexibility comprising, a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer coated with a pressure-sensitive adhesive coating, said elastomer layer having an elasto

A coated bonding tape having improved peel strength combined with low temperature flexibility comprising, a layer of impact-resistant material constituted by a milled layer of pigmented and plasticized elastomer coated with a pressure-sensitive adhesive coating, said elastomer layer having an elastomer component consisting essentially of a mixture of butyl rubbers, pigment and plasticizer for said elastomer sufficient to provide a half thickness reduction at a pressure below 800 psi, at least about 45% of said butyl rubber mixture being cross-linked, at least about 20% of said butyl rubber mixture being noncross-linked with an average molecular weight above about 250,000, and at least about 60% of said pigment having reinforcing character, the proportion of plasticizer providing a tape body having a tensile strength of at least about 30 psi before plastic flow begins, and said pressure-sensitive adhesive coating being selected to provide a bond to said tape body strong enough to force said bonding tape to fail cohesively when peeled from a substrate.