Method for rosin esterification in the presence of phosphinic ac

Details Method for rosin esterification in the presence of phosphinic ac Method for rosin esterification in the presence of phosphinic ac

1986-11-17

1988-02-16

Anderson, Harold D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260108, 260109, 524272, C09F 104, C09F 100, C08L 2300

Patent

active

047253843

ABSTRACT:
The treatment of a rosin ester prepared by reacting rosin and a polyhydric alcohol in the presence of a catalytic combination of phosphinic acid (also called hypophosphorous acid) and a phenol sulfide compound with a magnesium salt of an organic acid is disclosed to improve the clarity and viscosity stability of hot melt adhesives when used as a tackifier in the adhesive formulation. According to the process of the invention, a rosin is reacted with up to a 50% equivalent excess of the polyhydric alcohol in the presence of phosphinic acid and a phenol sulfide compound at a temperature of from about 180.degree. C. to about 300.degree. C. and the reaction product is treated subsequently with from 0.01% to 5.0% of a magnesium salt of an organic acid.

REFERENCES:
patent: 3377334 (1968-04-01), McBride et al.
patent: 3780013 (1973-12-01), Smith
patent: 3784537 (1974-01-01), Scharrer
patent: 4548746 (1985-10-01), Duncan et al.
patent: 4643848 (1987-02-01), Thomas et al.
patent: 4650607 (1987-03-01), Lampo et al.

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