Additive composition and method for increasing the upper service temperature of adhesives
AssigneeArizona Chemical Company
InventorsXinya Lu, Wayne K. Chu
Life of this patent
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Abstract
The specification discloses an additive composition for use in preparing adhesive formulations, particularly hot melt adhesive formulations based on A-B-A block copolymers which exhibit increased upper service temperatures. The additive composition comprises a preblend of of an A-block compatible reinforcing resin having a number average molecular weight ranging from about 2,000 to about 10,000 Daltons and a polydispersity index of less than about 4.0 and a B-block compatible resin. The A-block compatible reinforcing resin/B-block resin preblend enables introduction of more A-block reinforcing resin into the composition thereby increasing the overall upper service temperature of the adhesive formulation.
Claims10
An additive composition for increasing the upper service temperature of an A-B-A block copolymer adhesive composition with styrenic A-blocks and an elastomeric conjugated diene midblock B, the additive comprising a blend containing from about 5 to about 45 parts by weight of an A-block compatible reinforcing resin selected from the class consisting of tetramethyl polycarbonate-based resins (TMPC resins) having polydispersity indices of less than about 4.0 and number average molecular weights ranging from about 2,000 to about 10,000 Daltons and from about 1 to about 450 parts by weight of a B-block compatible resin, wherein the B-block compatible resin has a glass transition temperature (T.sub.g) within the range of from about 0.degree. to about 100.degree. C.
An additive composition for increasing the upper service temperature of an A-B-A block copolymer adhesive composition having styrenic A-blocks and an elastomeric conjugated diene midblock B, the additive comprising a blend containing from about 10 to about 40 parts by weight of tetramethyl polycarbonate (TMPC) and from about 1 to about 450 parts by weight of a B-block compatible resin, wherein the TMPC has a glass transition temperature (T.sub.g) within the range of from about 130.degree. to about 185.degree. C. and a polydispersity index of less than about 4.0.
An additive composition for increasing the upper service temperature of an A-B-A block copolymer adhesive composition with styrenic A-blocks and an elastomeric conjugated diene midblock B, the additive comprising a blend containing from about 5 to about 45 parts by weight of an A-block compatible reinforcing resin selected from the class consisting of tetramethyl polycarbonate-based resins (TMPC resins) having polydispersity indices of less than about 4.0 and number average molecular weights ranging from about 2,000 to about 10,000 Daltons and from about 1 to about 450 parts by weight of a B-block compatible resin selected from the group consisting of aromatic modified terpenes, terpene phenols, rosin esters, polymerized rosin, C.sub.5 -C.sub.9 resins, dicyclopentadiene and mixtures thereof.
Dependencies are inferred from the claim text.