Conveyors: power-driven – Conveyor section – Endless conveyor
Reexamination Certificate
2005-09-27
2005-09-27
Matecki, Kathy (Department: 3651)
Conveyors: power-driven
Conveyor section
Endless conveyor
Reexamination Certificate
active
06948612
ABSTRACT:
To provide a coating composition of a soluble aromatic polyimide having good heat resistance and mechanical strength. As a soluble polyimide, a compound of the formula (I) in which R's represent independently from one another H, halogen, an alkyl group or an alkoxy group, or a substituted or unsubstituted phenyl group; A is a tetravalent aromatic group or a group of the formula (II) in which B is a covalent bond, a >C(R2)2group, a carbonyl group, O, S, a >SO2, group, a >Si(CH3)2group, a >Si(C2H5)2group, a >NR3group or a bifunctional ether group in which R2is a hydrogen atom or —C(R4)3, R3is H, an alkyl group or an aryl group, and R4is H, F or Cl; Ar is an aromatic nucleus or a group of the formula (III) in which Ar and B are the same as defined above, and each p is an integer of 0 to 10; m is an integer of 1 to 10 is used. The polyimide has a weight average molecular weight of 150,000 to 1,000,000.
REFERENCES:
patent: 4998143 (1991-03-01), Kumasaka et al.
patent: 5661838 (1997-08-01), Muehlemann et al.
patent: 6198899 (2001-03-01), Takahashi et al.
patent: 6652938 (2003-11-01), Nishikawa et al.
Ayukawa Hiroshi
Kobayashi Mitsuaki
Dahl Philip Y.
Deuble Mark A.
Matecki Kathy
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