Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2002-08-15
2004-09-21
Gorr, Rachel (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C528S049000, C528S075000, C428S423100
Reexamination Certificate
active
06794422
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to novel polymerizable solid aliphatic polyurethanes containing olefinically unsaturated double bonds and based on linear diisocyanates. The present invention also relates to the use of the novel aliphatic polyurethanes as novel powder coating materials or for preparing novel powder coating materials. The present invention relates not least to the use of the novel powder coating materials for producing coatings on primed or unprimed substrates.
2. Description of the Background
German patent application DE-A-24 36 186 discloses a polyurethane prepared from tolylene diisocyanate, an aromatic nonlinear diisocyanate, 2-hydroxyethyl methacrylate, and trimethylolpropane in a molar ratio of 3:3:1. The polyurethane has a melting point of approximately 65° C. and a polymerizable double bond content of 2.9 double bonds per 1000 molecular weight. It can be used per se as a powder coating material curable with actinic radiation. Owing to the presence of aromatic structures, the coatings produced from it are not stable to weathering but instead tend to yellow under the effect of sunlight.
European patent application EP-A-0 410 242 discloses polyurethanes containing (meth)acryloyl groups in an amount corresponding to from 3 to 10% by weight, based on the polyurethane, of ═C═C═ (molecular weight 24). These known polyurethanes have unspecified melting points or melting ranges in the temperature range from 50 to 180° C. They are prepared using isophorone diisocyanate, 4,4′-diisocyanatodicyclohexylmethane, 4,4′-diisocyanatodiphenylmethane, its technical-grade mixtures with 2,4-diisocyanatodiphenylmethane, and, if desired, the higher homologs of these diisocyanates, 2,4-diisocyanatotoluene and its technical-grade mixtures with 2,6-diisocyanatotoluene (tolylene diisocyanate), and also biuret-, isocyanurate- or urethane-modified polyisocyanates based on these simple polyisocyanates. As regards the polyurethanes based on aromatic polyisocyanates, the comments made above apply. Additionally it is difficult to use these polyisocyanates as a basis for preparing polyurethanes having a particularly narrow melting range, let alone a defined melting point. In particular, the use of polyisocyanates having an average functionality >2 leads to polyurethanes having an undesirably broad molecular weight distribution, making them of only limited usefulness in one-component powder coating materials.
SUMMARY OF THE INVENTION
It is an object of the present invention to find novel polymerizable solid polyurethanes, containing olefinically unsaturated double bonds, which no longer have the disadvantages of the prior art but instead possess a very narrow melting range within the temperature range 40 to 200° C. and can be used as powder coating materials or for preparing powder coating materials which give weathering-stable and nonyellowing coatings.
Found accordingly has been the novel polymerizable solid aliphatic polyurethane containing olefinically unsaturated double bonds and having a very narrow melting range within the temperature range from 40 to 200° C., which is preparable from
A) at least one linear aliphatic diisocyanate,
B) at least one aliphatic compound containing at least two isocyanate-reactive functional groups and/or water, and
C) at least one olefinically unsaturated compound containing an isocyanate-reactive functional group.
REFERENCES:
patent: 6360974 (2002-03-01), Sacharski et al.
patent: 24 36 186 (1975-03-01), None
patent: 36 36 183 (1988-03-01), None
patent: 0 410 242 (1991-01-01), None
patent: 0 596 460 (1993-11-01), None
patent: 0 650 978 (1994-10-01), None
patent: 0 650 979 (1994-10-01), None
patent: 0 650 985 (1994-10-01), None
patent: 0 924 234 (1999-06-01), None
patent: 2 290 793 (1996-01-01), None
patent: 9535332 (1995-12-01), None
patent: 99 14254 (1999-03-01), None
Georg Thieme, ed.; “Oligomers” Roempp Lexikon Lacke und Duckfarben, p. 425 1998.
Georg Thieme, ed.; “Fuellstoffe” Roempp Lexikon Lacke und Druckfarben, pp. 250-252 1998.
Georg Thieme, ed.: “Photoinitiatoren” Roempp Chemie Lexikon, 9thexpanded and Rev. Ed., vol. 4, pp. 444-446 1991.
Georg Thieme, ed. Roempp Lexikon Lacke und Druckfarben, p. 354 1998.
Georg Thieme, ed. Roempp Lexicon Lacke und Druckfarben, p. 176 1998.
Georg Thieme, ed.; “Metalloxid-glimmer-pigmante” Roempp Lexikon Lacke und Druckfarben, pp. 380-3811 1998
Georg Thieme, ed.; “Eisenoxid-pigmente” Roempp Lexikon Lacke und Druckfarben, pp. 180-181 1998.
Georg Thieme, ed. “Pigmentorientierung” Roempp Lexikon Lacke und Druckfarben, pp. 451-453 1998.
Georg Thieme, ed. Roempp Lexikon Lacke und Druckfarben, p. 563 1998.
Georg Thieme, ed. Roempp Lexikon Lacke und Druckfarben, p. 567 1998.
Blum Rainer
Bruchmann Bernd
Paulus Wolfgang
Schwalm Reinhold
BASF - Aktiengesellschaft
Gorr Rachel
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
LandOfFree
Polymerizable solid aliphatic polyurethanes which contain... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Polymerizable solid aliphatic polyurethanes which contain..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Polymerizable solid aliphatic polyurethanes which contain... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3260785