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
1981-09-11
1984-10-16
Michl, Paul R.
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...
524458, 524460, 524523, C08L 3302
Patent
active
044776225
ABSTRACT:
Disclosed are contact adhesives, containing aqueous polymeric latexes, particularly acrylic latexes. Contact adhesives are adhesives which dry to a non-tacky state but which will adhere to another surface of the same dried adhesive. A unique feature of the adhesives is that the polymer used therein has an extremely wide range of molecular weights with substantial proportions of the product having a low molecular weight and substantial portions having a very high molecular weight, preferably with fairly uniform progression from low molecular weight to high molecular weight. However, blends of a low molecular weight fraction and a high molecular weight polymer may also be used. The preferred procedure is to prepare an emulsion polymer by reacting part of the material in the reactor in such a way as to obtain a high molecular weight product and to react at least one other portion of the monomer in the same reactor in such a way as to obtain at least one low molecular weight fraction. The adhesives preferably contain an aminoplast or a phenoplast as a tackifier and crosslinker and may contain a thickening agent such as polyvinyl alcohol. Also disclosed are articles of manufacture laminated by means of the adhesives and methods of preparing the same.
REFERENCES:
patent: 3932335 (1976-01-01), Gorton
patent: 4033918 (1977-07-01), Hauber
patent: 4126595 (1978-11-01), Martorano
patent: 4254004 (1981-03-01), Abbey
Gehman David R.
Sanderson F. Thomas.
Doherty Robert A.
Michl Paul R.
Rohm and Haas Company
Sluzas Alex
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