Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-05-26
1983-12-06
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
528125, 528126, 528128, C08G 6540, C08G 6548
Patent
active
044194862
ABSTRACT:
A polyaryletherketone polymer which is a hydrophilic sulphonated polymer derived by controllably sulphonating a copolymer having the repeat unit of formula ##STR1## together with the repeat unit of formula ##STR2## at least 70% (preferably substantially all) of the units A being sulphonated after sulphonation and substantially all the units B remaining non-sulphonated after sulphonation. The sulphonation may be effected using 98% w/w concentrated sulphuric acid at an elevated temperature.
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patent: 4186262 (1980-01-01), Freeman et al.
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patent: 4268650 (1981-05-01), Rose
patent: 4273903 (1981-06-01), Rose
Imperial Chemical Industries plc
Lee Lester L.
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