Process for the manufacture of soluble copolymers which contain hydroxyl groups and can be crosslinked with organic polyisocyanates
AssigneeHoechst Aktiengesellschaft
InventorHorst Dalibor
Life of this patent
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Abstract
The present invention relates to a process for the manufacture of soluble copolymers, which contain hydroxyl groups, can be crosslinked with organic polyisocyanates and are based on mixtures of styrene, methyl methacrylate, hydroxyethyl methacrylate, acrylic acid and glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids, by heating in inert organic solvents in the presence of polymerisation initiators and optionally chain stoppers, simultaneous esterification and polymerization taking place.
Claims13
Process for the manufacture of coatings from copolymers containing hydroxyl groups, which copolymers are reaction products of mixtures of styrene, methyl methacrylate, hydroxyethyl methacrylate, acrylic acid and glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids or products of a reaction of acrylic acid and a glycidyl ester followed by copolymerization with the remaining compounds of the aformentioned mixtures, and from an organic polyisocyanate in a solvent comprising no active hydrogen atoms, wherein a mixture consisting of
- (A) a copolymer containing hydroxyl groups and consisting of
- (a) 20-25.9% by weight of styrene,
- (b) 20-24% by weight of methyl methacrylate,
- (c) 18-24% by weight of hydroxyethyl methacrylate,
- (d) 8.5-11% by weight of acrylic acid and
- (e) 29.0-35.0% by weight of glycidyl ester of .alpha.-alkylalanemonocarboxylic acid and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acid having the empirical formula C.sub.13 H.sub.24 O.sub.3 or wherein components d) and e) are incorporated as a prereacted product of the formula ##STR9## wherein R is the radical of .alpha.-alkylalkanemonocarboxylic acid and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acid and the radical has the empirical formula C.sub.10 H.sub.19 O.sub.2 in an amount of 37.5-46% by weight, and wherein the incorporated components (a), (b), (c), (d), and (e) have a total of 100% by weight, dissolved in a solvent containing no active hydrogen atoms, and
- (B) an organic polyisocyanate, the amount of the copolymer (A) and the polyisocyanate (B) in the coating mixture adding up to 100 percent by weight, and this mixture is shaped or applied to suitable substrate and the solvent is then removed, in order to obtain the finished coating.
Process for the manufacture of coatings from copolymers which contain hydroxyl groups and are reaction products of mixtures of styrene, methyl methacrylate, hydroxyethyl methacrylate, acrylic acid and glycidyl esters of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids, and from organic polyisocyanates in solvents which have no active hydrogen atoms, characterised in that a mixture which consists of
- A. a copolymer which contains hydroxyl groups and consists of
- (a) 20-25.9% by weight of styrene,
- (b) 20-24% by weight of methyl methacrylate,
- (c) 18-24% by weight of hydroxyethyl methacrylate,
- (d and e) 37.5-46% by weight of a reaction product of the formula ##STR11## wherein R is the radical of .alpha.-alkylalkanemonocarboxylic acids and/or .alpha.,.alpha.-dialkylalkanemonocarboxylic acids and the radical has the empirical formula C.sub.10 H.sub.19 O.sub.2, and in which the incorporated components (a), (b), (c), (d), the acrylic acid, and (e), the glycidyl ester used to prepare the above reaction product (d and e) add up to 100% by weight, dissolved in solvents which do not contain active hydrogen atoms, and (B) an organic polyisocyanate, which is reacted with the copolymer (A), the amounts of the copolymer (A) and the polyisocyanate (B) in the coating mixture adding up to 100 percent by weight, and this mixture of copolymer (A) and polyisocyanate (B) is shaped or applied to suitable substrates and the solvent is then removed, in order to obtain the finished coating.
Dependencies are inferred from the claim text.