Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1983-10-13
1985-08-06
Pertilla, Theodore E.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
524539, 525441, 4284231, 4284237, 428458, C08L 7506
Patent
active
045337047
DESCRIPTION:
BRIEF SUMMARY
Reference is made to concurrently filed and commonly assigned related U.S. application Ser. No. 555,463 entitled "Flexible Basecoat/Two Component Clearcoat Coating Compositions", abandoned in favor of continuation-in-part application U.S. Ser. No. 615,700 filed May 29, 1984, U.S. application Ser. No. 558,399 entitled "Flexible Two Component Urethane Coating Compositions", U.S. application Ser. No. 598,551 entitled "Flexible Uni-Basecoat/Two Component Clearcoat Coating Compositions", all to Kordomenos et al., and U.S. application Ser. No. 553,322 entitled "Flexible Coating Compositions", to Alexander et al.
TECHNICAL FIELD
This invention relates to flexible basecoat/clearcoat coating systems which have excellent adherence to metal and plastic substrates and possess superior weathering properties. Basecoat/clearcoat systems comprise a finish of a clearcoat top layer in film adherence to a basecoat that is in adherence to a substrate. More particularly, the invention relates to basecoat/clearcoat coating compositions which comprise hydroxy-containing urethane modified polyester, amine-aldehyde crosslinker, and, optionally, a high molecular weight linear polyurethane. The hydroxy-containing urethane modified polyesters of the pigmented basecoat are made by reacting polyester polyol resins with isocyanate, while the novel hydroxy-containing urethane modified polyesters of the clearcoat are made from urethane modified diols reacted with polyol and diacid component.
BACKGROUND ART
Recently, there has been interest in the use of rubbery resilient materials for areas which are subject to mechanical shock such as automobile bumpers, moldings and front ends. The use of such materials aids in providing protection from permanent structural damage but, in order to attain the desired appearance, a protective coating must have unique properties, such as a high degree of extensibility, impact resistance, resistance to cracking under severe environmental conditions, such as exposure to low temperature and low humidity. Conventional coatings, including those employed on rubber and similar extensible objects heretofore, do not have the required combination of properties. Generally compositions that are flexible enough to be applied over both metal and plastic substrates have rather poor weatherability and overall durability.
U.S. Pat. No. 3,882,189 and U.S. Pat. No. 3,962,522 are exemplary of numerous patents which describe flexible coating compositions wherein the resin comprises polyurethane modified polyesters formed by reacting polyisocyanate with polyester polyols. These resins are cured with amine aldehyde crosslinkers. It is taught therein, that the presence of the urethane groups in the polymer significantly contributes to the flexibility as well as improved weathering properties, gloss, and abrasion resistance of the coating. However, while it is thus desirable to employ a substantial number of urethane groups in these resins, the amount which may be included in these types of resins is limited. When hydroxy polyester resin is reacted with polyisocyanate it has a tendency to form a gelled mass and thus the amount of polyisocyanate that may be employed must be restricted in order to avoid gelation. Still further, these urethane linkages are added in a latter modification of the polyester polyol reaction product, rather than being incorporated into the backbone of the resin.
DISCLOSURE OF THE INVENTION
This invention is directed to flexible basecoat/clearcoat coating compositions which are suitable for use over various substrates. The compositions may be used over rubbery, resilient materials as well as over metal. The basecoat/clearcoat coating composition of this invention is characterized in that: average molecular weight (M.sub.n) of between about 1000 and about 10,000, (ii) having a hydroxyl number of between about 30 and about 200, and (iii) containing between about 1 and about 10 urethane groups per molecule, and being made from reactants comprising: about 4:1 to about 4:3; and average molecular weight
REFERENCES:
patent: 3763079 (1973-10-01), Fryd
patent: 3882189 (1975-05-01), Hudak
patent: 3954899 (1976-04-01), Chang et al.
patent: 3962522 (1976-06-01), Chang et al.
patent: 4017456 (1977-04-01), Tucker et al.
patent: 4021505 (1977-05-01), Wang
patent: 4034017 (1977-07-01), Chang et al.
patent: 4205115 (1980-05-01), Piccirilli et al.
patent: 4208495 (1980-06-01), Chang et al.
Alexander Delores J.
Kordomenos Panagiotis I.
Kurple Kenneth R.
Ford Motor Company
May Roger L.
Melotik Lorraine S.
Pertilla Theodore E.
LandOfFree
Flexible basecoat/clearcoat coating compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexible basecoat/clearcoat coating compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexible basecoat/clearcoat coating compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-513290