US4029886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for water-insolubilization of molded pullulan
Assignee: Hayashibara Seibutsu Kagaku Kenkyujo KK
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Filing: 1975-02-27
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Granted: 1977-06-14
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Expires: 1995-02-27
Abstract
Abstract A molded pullulan can be water-insolubilized by treatment with, as the combination of a crosslinking agent with a catalyst, at least one of the combinations of (1) formaldehyde with zinc chloride, (2) glyoxal with magnesium chloride, and (3) formaldehyde or glyoxal with hydrogen chloride gas or sulfurous acid gas.
Inventors
- 👤 Seizo Nakashio
- 👤 Kozo Tsuji
- 👤 Nobuhiro Toyota
- 👤 Fumio Fujita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:07
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08B; C08B37/00; C08B37/0006; C08B37/0009; C08B37/0018; C08J2305/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A process for the water-insolubilization of a molded pullulan, wherein molded pullan is treated with, at least one combination of a crosslinking agent with a catalyst, said combinations being selected from the group consisting of (1) formaldehyde with zinc chloride, (2) glyoxal with magnesium chloride, and (3) gaseous formaldehyde or glyoxal with hydrogen chloride gas or sulfurous acid gas.
Claim 2
Dependent Claim
59 words
A process for the water-insolubilization of a molded pullulan, wherein molded pullan is treated with, at least one combination of a crosslinking agent with a catalyst, said combinations being selected from the group consisting of (1) formaldehyde with zinc chloride, (2) glyoxal with magnesium chloride, and (3) gaseous formaldehyde or glyoxal with hydrogen chloride gas or sulfurous acid gas.
Claim 3
Dependent Claim
31 words
A process according to claim 1, wherein the crosslinking agent is used in an amount of 0.5 to 500 parts by weight per 100 parts by weight of the molded pullulan.
Claim 4
Dependent Claim
31 words
A process according to claim 1, wherein the catalyst is used in an amount of 0.0001 to 50 parts by weight per 100 parts by weight of the formaldehyde or glyoxal.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein the molded pullulan is treated at a temperature of 30° to 200° C.
Claim 6
Dependent Claim
22 words
A process according to claim 1, wherein the molded pullulan is treated under a pressure of 1 to 50 kg/cm 2 .
Claim 7
Dependent Claim
18 words
A process according to claim 1, wherein the molded pullulan is treated in the presence of a solvent.
Claim 8
Dependent Claim
36 words
A process according to claim 6, wherein the solvent is one member selected from the group consisting of alcohols; aromatic, aliphatic and alicyclic hydrocarbons; halogenated, nitrated and sulfonated derivatives of said hydrocarbons; ketones; ethers; and esters.
Claim 9
Dependent Claim
17 words
A process according to claim 7, wherein the solvent is methanol, ethanol, acetone or methyl ethyl ketone.
Claim 10
Dependent Claim
17 words
A process according to claim 8, wherein the solvent contains 1 to 30 wt % of water.
Claim 11
Dependent Claim
30 words
A process according to claim 6, wherein the solvent is used in an amount of 5 to 10,000 parts by weight per 100 parts by weight of the molded pullulan.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |