US 4,923,932 AGranted

Polyphenylene ether resin comprising chloroform extractable/nonextractable polyphenylene ether resin

AssigneeAsahi Kasei Kogyo Kabushiki Kaisha

InventorsTeruo Katayose, Hiroji Oda

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Abstract

A novel cured polyphenylene ether resin is disclosed comprising a chloroform nonextractable polyphenylene ether and a chloroform extractable polyphenylene ether. By subjecting the resin to pyrolysis gas chromatography, the resin is decomposed to form 3,5-dimethylphenol specifically. The chloroform extractable polyphenylene ether is contained in the resin in an amount of 0.01 to 20% by weight and comprises polyphenylene ether units substituted by an alkenyl group and/or an alkynyl group. The novel cured polyphenylene ether resin has excellent mechanical properties, electrical properties, heat resistance and chemical resistance. The cured polyphexylene ether resin is prepared by curing a novel curable polyphenylene ether resin comprising polyphenylene ether units substituted with an alkenyl groups and/or an alkynyl groups at a specific average substitution degree. The novel curable polyphenylene ether resin has not only excellent mechanical properties and desired electric properties such as a low dielectric constant and a low dielectric dissipation factor, but also excellent melt processability and storage properties.

Claims17

Dependent claims

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.degree. C. for 12 hours,
said chloroform extractable polyphenylene ether containing units of the formula:
##STR39## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 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 R.sup.5, R.sup.6 and R.sup.7 each independently represent a hydrogen atom or a methyl group,
or an alkynyl group represented by the formula:
(CH.sub.2).sub.k C.tbd.C--R.sup.8 (III)
wherein k is an integer of from 1 to 4 and R.sup.8 represents a hydrogen atom, a methyl group or an ethyl group,
at least one of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 being other than hydrogen,
with the proviso that each unit is the same or different.

8 more elements

A curable polyphenylene ether resin comprising at least one polyphenylene ether represented by the formula:

Q'--J--H].sub.m (IV)
wherein m is an integer of from 1 to 6, J is a polyphenylene ether chain comprising units of the formula:
##STR41## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 each independently represent a hydrogen atom, an alkenyl group represented by the formula:
##STR42## wherein l is an integer of from 1 to 4, and R.sup.5, R.sup.6 and R.sup.7 each independently represent a hydrogen atom or a methyl group;
or an alkynyl group represented by the formula:
--CH.sub.2 --.sub.k C.tbd.C--R.sup.8 (III)
wherein k is an integer of from 1 to 4 and R.sup.8 represents a hydrogen atom, a methyl group or an ethyl group,
at least one of R.sup.1, R.sup.2, R.sup.3, and R.sup.4 being other than hydrogen, and
Q' represents a hydrogen atom when m is 1, and Q' in each polyphenylene ether independently represents Q or Q substituted with at least one substituent selected from the group consisting of an alkenyl group as defined above and an alkynyl group as defined above when m is greater than 1,
said Q representing the residue of a polyfunctional phenol having from 2 to 6 phenolic hydroxyl groups and having unpolymerizable substituents at the ortho and para positions with respect to the phenolic hydroxyl groups,
with the proviso that each polyphenylene ether chain is the same or different,
said curable polyphenylene ether resin having an average substitution degree of alkenyl and alkynyl groups of from 0.1 to 100 % by mole as defined by the formula:
##EQU7## the ratio of the total number of moles of alkenyl and alkynyl groups to the number of moles of phenyl groups being determined in terms of the ratio of the total area of peaks attributed to the protons of alkenyl and alkynyl groups to the area of peak attributed to the protons of phenyl groups on a .sup.1 H-NMR spectrum of the curable polyphenylene ether resin.

10 more elements

Dependencies are inferred from the claim text.