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US 4,968,759 AGranted
Phenolic polymer and production thereof
AssigneeHitachi Chemical Company, Ltd.
InventorsTohru Kikuchi, Hiroyuki Kawakami, Takayuki Saito
Life of this patent
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Abstract
A phenolic polymer obtained by reacting a phenolic compound with a bis(hydroxyalkyl)benzene, followed by alkylation of ortho positions or para position with respect to the hydroxyl group of the terminal phenol groups of the produced polymer is suitable for use as a heat resistant antioxidant for thermoplastic resins
Claims7
A process for producing the phenolic polymer represented by the formula:
- ##STR14## wherein R.sub.1 is an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms;
- R.sub.2 and R.sub.3 are independently hydrogen, an alkyl group having 1 to 5 carbon atoms or an alkoxy group having 1 to 5 carbon atoms;
- R.sub.4 through R.sub.9 are independently hydrogen, or an alkyl group having 1 to 5 carbon atoms;
- R.sub.10 and R.sub.11 are independently an alkyl group having 1 to 5 carbon atoms;
- and n is 2 to 75 in average, which comprises reacting a phenolic polymer of the formula:
- ##STR15## wherein R.sub.1 through R.sub.9 and n are as defined above, with at least one compound of the formula:
- ##STR16## wherein R.sub.10 and R.sub.11 are as defined above, to carry out alkylation of ortho positions or para position with respect to the hydroxy group of the terminal phenol groups of the phenolic polymer of the formula [II].
4 more elements
A process according to claim 1, wherein the polymer of the formula [II] is produced by reacting a phenolic compound of the formula:
- ##STR17## wherein R.sub.1, R.sub.2 and R.sub.3 are defined as in claim 2, with a bis(hydroxyalkyl)benzene compound of the formula:
- ##STR18## wherein R.sub.4 through R.sub.5 are defined as in claim 11, in the presence of an alkylation catalyst.
Dependencies are inferred from the claim text.