Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-07-06
1988-11-15
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525369, 522153, C08F26502, C08F26702
Patent
active
047850590
ABSTRACT:
A hydrophilic, water-swellable graft copolymer comprising polyethylene vinyl acetate (PEVA) containing between 8 and 30 wt. % vinyl acetate units, radiation graft copolymerized with an ethylenic carboxylic acid and subsequently heat treated in an aqueous hydroxide solution at a temperature greater than the softening point of the PEVA. A process for the preparation of such a polymer by radiation induced graft copolymerization of PEVA with an ethylenic carboxylic acid and subsequent heat treatment in an aqueous hydroxide solution at a temperature greater than the softening point of the PEVA is also described. The polymers of the invention are suitable for making into devices for various applications, but are particularly useful for making surgical devices, such as laparascope tubes, urethal catheters, endovascular cannuli, for endoscopic access, and as endo-prostheses. Some examples of surgical uses of such devices using the invention are described.
REFERENCES:
patent: 4309525 (1982-01-01), Nakabayashi et al.
Chemical Abstracts, vol. 94, 2/81, No. 31745s, Japan Atomic Energy Research Institute.
Chemical Abstracts, vol. 86, 5/77, No. 122470z, Toyo Soda.
Fydelor Peter J.
Miller Ronald A.
Ramsay Jonathan W. A.
Ringrose Barbara J.
Doody Patrick A.
Michl Paul R.
The Secretary of State for Defence in Her Brittanic Majesty's Go
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