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US5250634A Expired / Lapsed US ⏱️ 0.0 years remaining

Powder coating composition

Assignee: Nippon Paint Co Ltd
•
Filing: 1991-06-28
•
Granted: 1993-10-05
•
Expires: 2011-06-28
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Abstract

Abstract A powder coating comprising, as main components. (A) a carboxyl group containing resin having a number average molecular weight of 1000-30000, an acid value of 5-200 KOH mg/g and a glass transition temp. of 20°-120° C., and (B) a polyglycidyl compound obtained by addition of a polyester oligomer having 2 or more carboxyl groups and a number average molecular weight of 200-1200, with an epoxy compound of the formula: ##STR1## , the ratio of carboxyl groups in (A) to glycidyl groups in (B) being, in terms of equivalent ratio, 0.5 to 2.0. This powder coating may result a coating with excellent processability, impact strength and the like and is excellent in storage stability, hardening properties either at high or low temperature and even when used a stored powder may result a coating with excellent processability.

Inventors

  • 👤 Yuji Toyoda
  • 👤 Akimitsu Uenaka
  • 👤 Tasaburo Ueno
  • 👤 Kouichi Tsutsui

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 17:02
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; C09D163/00; C09D163/06; C09D167/00; C08; C08L; C08L63/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 142 words
A powder coating composition comprising, as main components, (A) a carboxyl group containing resin having a number average molecular weight of 1,000-30,000, an acid value of 5-200 KOH mg/g and a glass transition temperature of 20° C.-120° C., and (B) a polyglycidyl compound having, on average, 2 to 6 glycidyl groups in its molecule, obtained by the addition reaction of a polyester oligomer having 2 or more carboxyl groups in its molecule and having a number average molecular weight of 200-1,200, with an epoxy compound of the formula (I): ##STR8## in which R 1 , R 2 and R 3 are the same or different groups and each represents hydrogen atom or methyl group, the ratio of carboxyl groups in said (A) resin to glycidyl groups in said (B) polyglycidyl compound being, in terms of functional group equivalent ratio, 0.5 to 2.0.
Claim 2
Dependent Claim 142 words
A powder coating composition comprising, as main components, (A) a carboxyl group containing resin having a number average molecular weight of 1,000-30,000, an acid value of 5-200 KOH mg/g and a glass transition temperature of 20° C.-120° C., and (B) a polyglycidyl compound having, on average, 2 to 6 glycidyl groups in its molecule, obtained by the addition reaction of a polyester oligomer having 2 or more carboxyl groups in its molecule and having a number average molecular weight of 200-1,200, with an epoxy compound of the formula (I): ##STR8## in which R 1 , R 2 and R 3 are the same or different groups and each represents hydrogen atom or methyl group, the ratio of carboxyl groups in said (A) resin to glycidyl groups in said (B) polyglycidyl compound being, in terms of functional group equivalent ratio, 0.5 to 2.0.
Claim 3
Dependent Claim 14 words
A powder coating according to claim 1, wherein said (A) resin is polyester resin.
Claim 4
Dependent Claim 14 words
A powder coating according to claim 1, wherein said (A) resin is acrylic resin.

References Cited (Backward Citations)

JPS5269935A Cited
DE2758006A1 Cited
JPS54118436A Cited
JPS57108166A Cited
JPS59230069A Cited
US4904746A Cited
US5034432A Cited
EP0387692A2 Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-10-04 1997-04-05 1997-10-05 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-10-04 2001-04-05 2001-10-05 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-10-04 2005-04-05 2005-10-05 $7700.00 Window Closed / Lapsed

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