Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1995-06-07
1998-04-07
Smith, Jeffrey T.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253306, 525379, 525384, C08F 814
Patent
active
057366160
ABSTRACT:
Disclosed is a process for esterifying and/or transesterifying a polymer having a polyethylenic backbone and pendant acid and/or ester moieties comprising contacting a melt of the polymer with a transesterifying compound so that the polymer undergoes esterification and/or transesterification but not alcoholysis. The esterified or transesterified polymer also has pendant ester moieties which differ in kind and/or number from the unreacted polymer. In one embodiment, the process also comprises adding an amount of a transition metal salt that is effective to promote oxygen scavenging. Also in a further embodiment, the process comprises irradiating the transesterified polymer with actinic radiation to reduce the induction period before oxygen scavenging commences. Also disclosed are compositions comprising a component which comprises an ethylenic or polyethylenic backbone and a pendant or terminal moiety comprising a benzylic, allylic, or ether-containing radical. The invention also embodies new polyethylenic oxygen scavenging compositions comprising a transition-metal salt and the above component. Methods of making the compositions, and methods and compositions using the ethylenic or polyethylenic compositions, are disclosed.
REFERENCES:
patent: 4124549 (1978-11-01), Hashiudo et al.
patent: 4404299 (1983-09-01), Decroix
patent: 4755379 (1988-07-01), Jozefonvicz et al.
patent: 4973733 (1990-11-01), Valkovich et al.
patent: 5202052 (1993-04-01), Zenner et al.
Ching Ta Yen
Current Steven P.
Katsumoto Kiyoshi
Theard Leslie P.
Chevron Chemical Company
Michel Marianne H.
Smith Jeffrey T.
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