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
1985-06-18
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...
427409, 4274125, 4284237, 4284253, 524539, 525443, 525456, C08L 7506, C08L 6702
Patent
active
045241929
DESCRIPTION:
BRIEF SUMMARY
Reference is made to concurrently filed and commonly assigned related U.S. applications Ser. No. 555,463 entitled "Flexible Basecoat/Two Component Clear Coat Coating Compositions", abandoned in favor of application 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. 592,124 entitled "Flexible Basecoat/Clearcoat Coating Compositions", to Alexander et al.
TECHNICAL FIELD
This invention relates to flexible coating compositions which have excellent adherence to metal or plastic and possess superior weathering properties. This composition can be employed as a single coating, in combination with other coatings, or can be used for each coat of a basecoat/clearcoat system. More particularly, the invention relates to coating compositions which comprise hydroxy-containing urethane modified polyester made from urethane modified diols reacted with polyol and diacid, amine-aldehyde crosslinker, and, optionally, a high molecular weight linear polyurethane.
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 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 coating composition of this invention is characterized in that it comprises: 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; linear polyurethane having a number average molecular weight between about 15,000 and about 40,000, preferably of between about 20,000 and about 30,000.
These flexible coating compositions may also be employed as the basecoat composition and clearcoat composition of basecoat/clearcoat systems. In such systems, the clearcoat co
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patent: 3882189 (1975-05-01), Hudak
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Alexander Delores J.
Kordomenos Panagiotis I.
Kurple Kenneth R.
May Roger L.
Melotik Lorraine S.
Pertilla Theodore E.
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