×

Polyphenylene ether resin comprising chloroform extractable/nonextractable polyphenylene ether resin

  • US 4,923,932 A
  • Filed: 09/09/1988
  • Issued: 05/08/1990
  • Est. Priority Date: 09/09/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A cured polyphenylene ether resin comprising a chloroform nonextractable polyphenylene ether and a chloroform extractable polyphenylene ether,said resin being decomposable by pyrolysis gas chromatography to form (a) 2-methylphenol, (b) 2,6-dimethylphenol, (c) 2,4-dimethylphenol, (d) 3,5-dimethylphenol and (e) 2,4,6-trimethylphenol in proportions such that said components (a), (b), (c), (d) and (e) satisfy the following inequality:

  • ##EQU6## wherein A, B, C, D and E represent the areas of peaks on a pyrolysis gas chromatogram attributed to said components (a), (b), (c), (d) and (e), respectively,said chloroform extractable polyphenylene ether being present in an amount of from 0.01 to 20 % by weight, based on the weight of said resin, as determined from the amount of a chloroform extract obtained by treating the resin with chloroform at 23°

    C. for 12 hours,said chloroform extractable polyphenylene ether containing units of the formula;

    ##STR39## wherein R1, R2, R3 and R4 each independently represent a hydrogen atom, an alkenyl group represented by the formula;

    ##STR40## wherein l is an integer of from 1 to 4, and R5, R6 and R7 each independently represent a hydrogen atom or a methyl group,or an alkynyl group represented by the formula;

    
    
    space="preserve" listing-type="equation">(CH.sub.2).sub.k C.tbd.C--R.sup.8 (III) wherein k is an integer of from 1 to 4 and R8 represents a hydrogen atom, a methyl group or an ethyl group,at least one of R1, R2, R3 and R4 being other than hydrogen,with the proviso that each unit is the same or different.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×