Crystallizable pinene-based tackifiers for temperature switchable adhesives
OwnerRobert Burchinventor
Life of this patent
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Abstract
Pinene copolymers which function as crystallizable tackifiers are described. Also described are temperature switchable pressure sensitive adhesives comprising an elastomer and a crystallizable pinene-based tackifier. These pressure sensitive adhesives exhibit a sharp reduction in peel strength when the temperature is raised above the switching temperature. The adhesive properties of these adhesives may be readily tuned by adjusting the ratio of the elastomer and the crystallizable tackifier, and by altering the crystallizable group on the tackifier. The temperature switchable pressure sensitive adhesives have use in medical, consumer, and industrial applications.
Claims28
A copolymer comprising:
- a) at least one pinene monomer selected from the group consisting of β-pinene and α-pinene oxide;
- and
- b) at least one comonomer selected from the group consisting of vinyl ethers, alkoxy styrenes, cyclopentadienes, and dicyclopentadienes, having at least one crystallizable group;
- wherein:
- (i) the crystallizable group is a linear or branched, substituted or unsubstituted alkyl or trans alkenyl group having from 12 to 30 carbon atoms, a fluoroalkyl or trans fluoroalkenyl group having from 12 to 30 carbon atoms, phenyl, benzyl, or naphthalenyl;
- and
- (ii) the copolymer is a random, blocky, or alternating copolymer in which the molar ratio of (a) to (b) is from about 4:1 to about 1:4 and has a number average molecular weight of at least about 400 Daltons.
A composition comprising:
- a) at least one elastomer;
- and
- b) at least one copolymer comprising:
- (i) at least one pinene monomer selected from the group consisting of β-pinene and α-pinene oxide;
- and
- (iii) at least one comonomer selected from the group consisting of vinyl ethers, alkoxy styrenes, cyclopentadienes, and dicyclopentadienes, having at least one crystallizable group;
- wherein:
- (A) the crystallizable group is a linear or branched, substituted or unsubstituted alkyl or trans alkenyl group having from 12 to 30 carbon atoms, a fluoroalkyl or trans fluoroalkenyl group having from 12 to 30 carbon atoms, phenyl, benzyl, or naphthalenyl;
- (B) the copolymer is a random, blocky, or alternating copolymer in which the molar ratio of (a) to (b) is from about 4:1 to about 1:4 and has a number average molecular weight of at least about 400 Daltons;
- and
- (C) the ratio of said elastomer to said copolymer is from about 3:1 to about 1:5 by weight.
A method for imparting temperature switchable properties to an elastomer comprising the steps of:
- a) providing at least one elastomer;
- and
- b) mixing the at least one elastomer with at least one copolymer comprising:
- (i) at least one pinene monomer selected from the group consisting of β-pinene and α-pinene oxide;
- and
- (ii) at least one comonomer selected from the group consisting of vinyl ethers, alkoxy styrenes, cyclopentadienes, and dicyclopentadienes, having at least one crystallizable group;
- wherein:
- (A) the crystallizable group is a linear or branched, substituted or unsubstituted alkyl or trans alkenyl group having from 12 to 30 carbon atoms, a fluoroalkyl or trans fluoroalkenyl group having from 12 to 30 carbon atoms, phenyl, benzyl, or naphthalenyl;
- (B) the copolymer is a random, blocky, or alternating copolymer in which the molar ratio of (a) to (b) is from about 4:1 to about 1:4 and has a number average molecular weight of at least about 400 Daltons;
- and
- (C) the ratio of said elastomer to said copolymer is from about 3:1 to about 1:5 by weight.
Dependencies are inferred from the claim text.