Rubber eraser and process for manufacturing it

Details Rubber eraser and process for manufacturing it Rubber eraser and process for manufacturing it

1994-12-13

1996-05-28

Smith, Jeffrey T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524279, 524296, 524297, 524339, 524425, C08K 542

Patent

active

055212395

ABSTRACT:
The invention concerns a rubber eraser made of a binder and plasticizer, as well as fillers, pigments and/or other additives, if applicable, which contains polyalkyl methacrylate (PAMA), especially polymethyl methacrylate (PMMA), polyethyl methacrylate (PEMA), polypropyl methacrylate (PPMA), polybutyl methacrylate (PBMA) and/or copolymerizates of these as the binder. Furthermore, the invention concerns processes for manufacturing such rubber erasers, where either first, a plastisol of fine-grain polyalkyl methacrylate and plasticizer is formed, and fillers, internal lubricants, pigments and/or other additives are then mixed into this plastisol, or according to which first, the PAMA powder, the filler as well as any other dry components such as internal lubricants, pigments, etc. are intimately mixed while dry, and the liquid plasticizer is then added to this mixture and mixed or kneaded in.

REFERENCES:
patent: 3878140 (1975-04-01), Sheppard
patent: 4288570 (1981-09-01), Coron et al.
patent: 4530806 (1995-07-01), Melchior

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