Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1991-02-22
1993-07-06
Page, Thurman K.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524274, 524285, 524287, 524210, 524211, 524241, 428230, 428243, 428245, C08L 3308, C08L 9304, C08L 2502, C08K 511
Patent
active
052254704
ABSTRACT:
Acrylic hot melt pressure sensitive adhesive compositions having a good balance of tack, peel and creep resistance at ambient temperature combined with optical clarity and desirable melt viscosity at elevated temperatures are prepared by copolymerizing acrylic and methacrylic alkyl esters of a non-tertiary alcohol or optionally acids with polymerizable poly methacrylate based macromonomers. The resulting acrylic copolymer has a graft or comb structure in which the acrylic backbone has a low Tg and the pendant macromonomer side chains have a Tg above room temperature. Compounding those acrylic copolymers with tackifiers and plasticizers dramatically improves the balance of pressure sensitive adhesive properties while lowering melt viscosity into a desirable range. The invention provides significant property enhancements even for acrylic copolymers having poor initial peel and shear adhesive properties. Preferably, the acrylic backbone is tailored by judicious selection of acrylic comonomers to allow compounding with several high performance hydrogenated tackifiers and plasticizers that provide water white and clear adhesive formulations while ensuring long term color stability, weatherability and general durability.
REFERENCES:
patent: 4554324 (1985-11-01), Husman et al.
patent: 4656213 (1987-04-01), Schlademan
patent: 5006582 (1991-04-01), Mancinelli
Derwent Abstract 88-040475[06] (1988).
Derwent Abstract 87-127147[18] (1987).
Derwent Abstract 87-040280[06] (1987).
Goodyear Tech Book Facts-Wingtack WT-3-Wingtack 10 Liquid Tackifying Resin-Date unknown.
Arakawa Tech Data-Akron-Ark-047 (Date unknown).
Arakaw Technical Data-KE-311 Specially Modified Rosin Ester (Date unknown).
Product Data, No. 7369-Regalrez Hydrocarbon Resins (Date unknown).
Product Data, No. 7205-9 Foral 105 Synthetic Resin (Date unknown).
Product Bulletin-Super Sta-Tac 100 Hydrocarbon Resin 47-411 (Reichhold Resin & Binders Division)-Date unknown.
Azpuru Carlos
Monssanto Company
Page Thurman K.
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