Radiation-curable rosin-based resins
AssigneeWestvaco Corporation
InventorG. Frederick Hutter
Life of this patent
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Abstract
This invention relates to novel radiation-curable, rosin-based resins and the process for preparing them. In particular, the invention relates to unsaturated polyester resins containing fully fumarated rosin and/or fully maleated rosin which have softening points of at least 80.degree. C. and are capable of being flaked into solid chips; a property that make the resins useful in formulating vehicles for lithographic printing inks and other coating applications.
Claims31
Radiation-curable rosin-based resins with a softening point of at least 80.degree. C. comprising reacting in a fusion reaction:
- (a) 12 to 68% by weight of a member selected from the group consisting of:
- fully maleated rosin, fully fumarated rosin, and combinations thereof;
- (b) 12 to 68% by weight of a member selected from the group consisting of:
- maleic anhydride, maleic acid, fumaric acid, and combinations thereof;
- (c) 15 to 40% by weight of a polyol;
- and
- (d) up to 20% by weight of a member selected from the group consisting of aromatic dibasic acid, saturated aliphatic dibasic acid, and combinations thereof.
Improved radiation-curable rosin-based resins comprising reacting in a fusion reaction:
- (a) a member of the group consisting of maleic anhydride, fumaric acid, and combinations thereof;
- and
- (b) a member of the group consisting of:
- a polyol and combination of polyols;
- wherein the improvement comprises replacing in said fusion reaction 20% to 80% of the standard dibasic acid with a member selected from the group consisting of fully maleated rosin, fully fumarated rosin, and combinations thereof, to produce resins with softening points of at least 80.degree. C.
Improved radiation-curable rosin-based resins comprising reacting in a fusion reaction:
- (a) a member of the group consisting of:
- maleic anhydride, fumaric acid, and combinations thereof;
- (b) a member of the group consisting of:
- a polyol, and combination of polyols;
- and
- (c) a member of the group consisting of:
- an aromatic dibasic acid, a saturated aliphatic dibasic acid, or combinations thereof;
- wherein the improvement comprises replacing in the said fusion reaction 20% to 80% of the standard dibasic acid with fully maleated rosin or fully fumarated rosin, or a combination thereof, to produce resins with softening points of at least 80.degree. C.
Dependencies are inferred from the claim text.