Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ethylenically unsaturated reactant admixed with either...
Patent
1981-03-25
1983-06-28
Liberman, Paul
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ethylenically unsaturated reactant admixed with either...
525440, 525454, 525455, 525920, 525922, C08L 6310, C08L 6706, C08L 7504
Patent
active
043906621
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hardenable resin composition which is high in toughness or tenacity and suitable for use in casting materials, coating materials, putty, adhesives, various types of linings and FRP. More particularly, the present invention pertains to an unsaturated polyester and/or an epoxy acrylate resin to which toughness is imparted by an unsaturated acrylic urethane.
BACKGROUND OF THE INVENTION
Due to its satisfactory handleability combined with its excellent properties such as mechanical and electrical properties as well as the resistance to heat and weather, unsaturated polyester resins are widely used as casting materials, coating materials, putty, adhesives, various types of linings, FRP etc. However, the unsaturated polyester resin products are hard and fragile, in other words, of less elongation and impact strength and, in most cases, incur problems such as breakage or cracking caused by impact in the course of production or transportation. Consequently, such products are considered unsuitable for use in applications where they are subjected to repeated impact and their use is indeed restricted to a considerable extent. Especially in the case of FRP, the demand for which is expanding as a substitute for metal, it is desired to improve the strength and toughness thereof, which properties are considered of vital importance. Even in the case of an epoxy acrylate resin, introduced with a view to eliminating and improving the brittleness and the resistance to chemicals of the unsaturated polyester resin, there is still much to be desired with respect to toughness.
To impart toughness to a resin, it has generally been proposed to plasticize the resin or add a rubber component thereto. In the former method, however, insufficient toughness is obtained, yet there is a decrease in heat resistance and mechanical strength. The latter method gives rise to an improvement in the toughness of a resin composition containing chopped strand glass and inorganic fillers such as BMC and SMC; however, its practical use is restricted to some extent since the resin composition is unstable; a product obtained therefrom by hardening suffers color shading; and the like. In fact, a rubber component has not been found, which has a toughness-imparting effect on FRP combined with casting or reinforcing materials.
As a result of extensive studies carried out for the purpose of obviating the disadvantages of the prior art unsaturated polyester and/or epoxy acrylate resins, it has been found that an unsaturated acrylic urethane has a toughness-imparting effect.
DESCRIPTION OF THE INVENTION
Thus, the present invention provides a curable resin composition characterized in that an unsaturated acrylic urethane prepared by addition reaction of a hydroxyl-terminated polymer, a polyisocyanate and a monohydroxylalkyl monoacrylate and/or a monohydroxylalkyl monomethacrylate (hereinafter referred to as the hydroxyl acrylates), substantially free from an isocyanate group and having a weight-average extension of molecular chain of 100 or more A calculated as polystyrene and as measured by gel permeation chromatography is added to at least one of an unsaturated polyester resin and an epoxy acrylate resin in an amount effective for the development of toughness.
In the present invention, no particular limitations are imposed upon the composition of the unsaturated polyester resin and epoxy acrylate resin used. In consideration of the mechanical strength and heat resistance which, in most cases, should be of sufficient value, however, it is desired that the thermal deformation temperature of the cast product be on the order of higher than 50.degree. C. In this connection, it should be noted that the use of a resin having a thermal deformation temperature of less than 50.degree. C. is not excluded from the scope of the present invention.
The unsaturated acrylic urethane which is a characteristic component of the resin composition according to the present invention is a mixture having a structure def
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Ando Tomonori
Hanyuda Toshiaki
Ochi Kiyoyuki
Okino Yoshiro
Sano Fumiaki
Liberman Paul
Showa Highpolymer Co. Ltd.
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