Patent US6343594B1 successfully refreshed from Google Patents.
Patent US4161467A successfully refreshed from Google Patents.
US4161467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactive catalyst for amino resins
Assignee: Teukros AG
•
Filing: 1977-10-04
•
Granted: 1979-07-17
•
Expires: 1997-10-04
Abstract
Abstract A reactive catalyst for the polycondensation of amino resins used for bonding water-penetrable cellulosic particles is disclosed. Said catalyst, if used in combination with a known catalyst, increases the rate of polycondensation of the resin while at the same time allowing the use of lower amounts of resin solids without imparting any loss in bonding strength. The catalyst comprises a concentrated aqueous solution of a mixture of organic and inorganic components, the organic components being formaldehyde and urea or a non resinous condensation product of formaldehyde and urea, and the inorganic component being a water-soluble alkali metal halide.
Inventors
- 👤 Andrew C. Markessini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:10
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/20; C08L61/22; C08L61/24; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A material for bonding together water-penetrable cellulosic particles which comprises: an amino resin, and 1 to 30% by weight of a catalyst system, calculated as 100% solids and based on the weight of the amino resin, to effect polycondensation of the amino resin, said catalyst system comprising an aqueous solution of an organic component and an inorganic component wherein the organic component is formaldehyde and urea or a nonresinous condensation product of formaldehyde and urea and the inorganic component is a water-soluble alkali metal halide.
Claim 2
Dependent Claim
85 words
A material for bonding together water-penetrable cellulosic particles which comprises: an amino resin, and 1 to 30% by weight of a catalyst system, calculated as 100% solids and based on the weight of the amino resin, to effect polycondensation of the amino resin, said catalyst system comprising an aqueous solution of an organic component and an inorganic component wherein the organic component is formaldehyde and urea or a nonresinous condensation product of formaldehyde and urea and the inorganic component is a water-soluble alkali metal halide.
Claim 3
Dependent Claim
12 words
The material defined in claim 1 wherein the amino resin is urea-formaldehyde.
Claim 4
Dependent Claim
12 words
The material defined in claim 1 wherein the amino resin is melamine-formaldehyde.
Claim 5
Dependent Claim
14 words
The material defined in claim 1 wherein the alkali metal halide is sodium chloride.
Claim 6
Dependent Claim
63 words
The material defined in claim 1 wherein the ratio of the organic component to the inorganic component of the catalyst system is 0.1 to 1.5 parts by weight of the organic component to 1.0 part by weight of the inorganic component, and wherein the amount of water in said catalyst system is dependent upon the solubility of the organic and the inorganic components.
Claim 7
Dependent Claim
29 words
The material defined in claim 1 wherein the catalyst system further comprises a surface active agent in an amount of 0.1 to 2% by weight of the catalyst system.
Claim 8
Dependent Claim
32 words
The material defined in claim 1 wherein 8 to 12 parts of ammonium chloride by weight are added per 70 to 160 parts by weight of a solution of the amino resin.
References Cited (Backward Citations)
US3697355A
Cited
US3905847A
Cited
US3842039A
Cited
US3826770A
Cited
US4075149A
Cited
US4082904A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-16 | 1983-01-15 | 1983-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-16 | 1987-01-15 | 1987-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-16 | 1991-01-15 | 1991-07-17 | $7700.00 | Window Closed / Lapsed |