Claims
- 1. A process for preparing a colorless rosin, which comprises simultaneously subjecting a purified rosin to disproportionation and dehydrogenation in the presence of a catalyst, and then adding an organic phosphorus compound to the reaction system.
- 2. The process of claim 1, wherein said catalyst is a palladium catalyst, a rhodium catalyst or a platinum catalyst.
- 3. The process of claim 1, wherein a reaction pressure in said reactions is less than 10 Kg/cm.sup.2.
- 4. The process of claim 1, wherein a composition of resin acids in the rosin obtained by said reactions is 15 to 35% by weight of dihydro component and 85 to 65% by weight of dehydroabietic acid.
- 5. The process of claim 1, wherein an amount of said added organic phosphorus compound is 0.01 to 1.0% by weight on the basis of the amount of said purified rosin.
- 6. The process of claim 1 wherein said organic phosphorus compound is represented by the following formula:
- (R--O--).sub.3 --P
- wherein R groups are the same or different, and each is a member selected from the group consisting of a C.sub.1 -C.sub.12 alkyl group, phenyl group, a phenyl group substituted by a C.sub.1 -C.sub.12 alkyl group and a phenyl group substituted by two C.sub.1 -C.sub.12 alkyl groups.
- 7. A process for preparing a colorless rosin, which comprises dehydrogenating a purified disproportionated rosin in the presence of a dehydrogenating catalyst.
- 8. The process of claim 1, wherein said catalyst is a palladium catalyst, a rhodium catalyst or a platinum catalyst.
- 9. The process of claim 1, wherein a reaction pressure in said dehydrogenation is less than 10 Kg/cm.sup.2.
- 10. The process of claim 1, wherein a composition of resin acids in the rosin obtained by said dehydrogenation is 15 to 35% by weight of dihydro component and 85 to 65% by weight of dehydroabietic acid.
- 11. The process of claim 2, wherein a reaction pressure in said reactions is less than 10 Kg/cm.sup.2.
- 12. The process of claim 2, wherein a composition of resin acids in the rosin obtained by said reactions is 15 to 35% by weight of dihydro component and 85 to 65% by weight of dehydroabietic acid.
- 13. The process of claim 2, wherein said organic phosphorus compound is represented by the following formula:
- (R--O--).sub.3 --P
- wherein R groups are the same or different, and each is a member selected from the group consisting of a C.sub.1 -C.sub.12 alkyl group, phenyl group, a phenyl group substituted by a C.sub.1 -C.sub.12 alkyl group and a phenyl group substituted by two C.sub.1 -C.sub.12 alkyl groups.
- 14. The process of claim 8, wherein a reaction pressure in said dehydrogenation is less than 10 Kg/cm.sup.2.
- 15. The process of claim 8, wherein a composition of resin acids in the rosin obtained by said dehydrogenation is 15 to 35% by weight of dihydro component and 85 to 65% by weight of dehydroabietic acid.
Priority Claims (4)
Number |
Date |
Country |
Kind |
3-356000 |
Dec 1991 |
JPX |
|
4-101795 |
Mar 1992 |
JPX |
|
4-101799 |
Mar 1992 |
JPX |
|
4-192644 |
Mar 1992 |
JPX |
|
CROSS-REFERENCE TO RELATED APPLICATION
This application is a divisional application of U.S. Ser. No. 08/107,685, filed Aug. 17, 1993, which is a U.S. national phase application of PCT/JP92/01653, filed Dec. 17, 1992.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0121125 |
Oct 1984 |
EPX |
1541122 |
Oct 1968 |
FRX |
2429248 |
Jan 1980 |
FRX |
60-81269 |
May 1985 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Supplementary European Search Report in European Patent Appln. No. 93900394.3 mailed Jul. 8, 1994. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
107685 |
Aug 1993 |
|