Stabilized rosin ester and pressure-sensitive adhesive and hot-melt composition based thereon
AssigneeArakawa Kagaku Kogyo Kabushiki Kaisha
InventorsKohtaro Matsuo, Seiichi Tsuchida
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Abstract
A process for preparing a stabilized rosin ester having a higher softening point which comprises subjecting a rosin to disproportionation and purification, and esterifying the resulting purified disproportionated rosin with a tri- or more valent polyhydric alcohol to give a rosin ester having a softening point (according to ring and ball method) of 65.degree. to 140.degree. C. The resulting rosin ester has superior heat resistance and aging resistance as well as a high softening point and is suitably employed as a tackifier for pressure-sensitive adhesive compositions and hot-melt compositions.
Claims10
A pressure-sensitive adhesive composition comprising an elastomer and a stabilized rosin ester having a higher softening point, the rosin ester being prepared by subjecting a rosin to disproportionation and purification, and esterifying, the resulting purified disproportionated rosin with a tri- or more valent polyhydric alcohol.
A hot-melt composition comprising at least one of an ethylenic copolymer and a wax, and a stabilized rosin ester having a higher softening point, the rosin ester being prepared by subjecting a rosin to disproportionation and purification, and esterifying the resulting purified disproportionated rosin with a tri- or more valent polyhydric alcohol.
Dependencies are inferred from the claim text.