Polyamide resin

Details Polyamide resin Polyamide resin

2005-01-11

2005-01-11

Hightower, P. Hampton (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S170000, C528S312000, C528S313000, C528S321000, C528S322000, C528S332000, C528S335000, C528S336000, C528S337000, C528S339000, C524S414000, C524S600000, C524S602000, C524S606000, C524S710000, C428S034100, C428S036900, C428S474400

Reexamination Certificate

active

06841651

ABSTRACT:
The polyamide resin of the present invention is produced by polycondensation of a diamine component comprising 70 mol % or more of m-xylylenediamine and a dicarboxylic acid component comprising 70 mol % or more of a C4-C20 α, ω-straight-chain aliphatic dicarboxylic acid in the presence of at least one phosphorus compound selected from the group consisting of phosphinic acid compounds and phosphonous acid compounds and in the presence of an alkali metal compound of a weak acid. The weak acid has a dissociation constant lower than a first dissociation constant of a dicarboxylic acid mainly constituting the polyamide resin. The polyamide resin satisfies the following requirements (A), (B) and (C):in-line-formulae description="In-line Formulae" end="lead"?14000≦a≦40000  (A)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?b≦1.000  (B)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.9930≦b−1.1a2×10−11+3.2a×10−7≦0.9980  (C)in-line-formulae description="In-line Formulae" end="tail"?wherein a and b are as defined in the disclosure.

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European International Search Report dated Jun. 4, 2003 for EP 03 00 7520 mailed with Communication dated Jun. 16, 2003.

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