Patent US4880870A successfully refreshed from Google Patents.
US4880870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer granulate, a process for its preparation, and its use
Assignee: Hoechst AG
•
Filing: 1985-07-30
•
Granted: 1989-11-14
•
Expires: 2005-07-30
Abstract
Abstract A polymer granulate whose particles consist of a core component and a coating component can be prepared by mixing a granular polymer with a pulverulent coating agent. The core component is made of a water-soluble polymer, in particular a polyvinyl alcohol. The coating component is a water-soluble or water-insoluble substance which is applied to the water-moistened particles of the core component. The particles of the polymer granulate have diameters within the range from 0.6 to 6 mm. The granulate has particularly good freeflowing properties; it is especially suitable for preparing adhesives.
Inventors
- 👤 Wolfgang Zimmermann
- 👤 Albrecht Harreus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:39
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J3/05; C08J3/12; C08J3/124; C08J2300/00; C08J2300/14; C08J2329/00; C08J2329/02; C08J2329/04; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995; Y10T428/2998
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
84 words
A polymer granulate which is useful for preparing adhesives or coatings and whose particles consist of a core component and a coating component in a weight ratio of 50 to 98:50 to 2, wherein the core component is a water-soluble granular polyvinylalcohol, the coating component is more finely granular than the core component and is a member selected from the group consisting of boric acid, starch, a cellulose derivative, kaolin, silicon carbide and polyvinylalcohol, and the particles have diameters from 0.6 to 6 mm.
Claim 2
Dependent Claim
84 words
A polymer granulate which is useful for preparing adhesives or coatings and whose particles consist of a core component and a coating component in a weight ratio of 50 to 98:50 to 2, wherein the core component is a water-soluble granular polyvinylalcohol, the coating component is more finely granular than the core component and is a member selected from the group consisting of boric acid, starch, a cellulose derivative, kaolin, silicon carbide and polyvinylalcohol, and the particles have diameters from 0.6 to 6 mm.
Claim 3
Dependent Claim
16 words
A polymer granulate as claimed in claim 1, wherein the coating component is a water-soluble compound.
Claim 4
Dependent Claim
25 words
A polymer granulate as claimed in claim 2, wherein the water-soluble compound is an organic polymer which differs from the polymer of the core component.
Claim 5
Dependent Claim
16 words
A polymer granulate as claimed in claim 1, wherein the coating component is a water-insoluble compound.
Claim 6
Dependent Claim
23 words
A polymer granulate as claimed in claim 2, wherein the coating component is a compound which can form a complex with polyvinyl alcohol.
Claim 7
Dependent Claim
23 words
A polymer granulate as claimed in claim 1 having a weight ratio of core component to coating component of from 70:30 to 95:5.
Claim 8
Dependent Claim
35 words
A polymer granulate as claimed in claim 1 having at most 30 percent by weight of constituents which are volatile at from 100° to 120° C. and at least 70 percent by weight of solids.
Claim 9
Dependent Claim
37 words
A polymer granulate as claimed in claim 1 having from 3 to 15 percent by weight of constituents which are volatile at from 100° to 120° C. and from 85 to 97 percent by weight of solids.
Claim 10
Dependent Claim
15 words
A polymer granulate as claimed in claim 1 wherein the coating component is boric acid.
Claim 11
Dependent Claim
15 words
A polymer granulate as claimed in claim 6 wherein the coating component is boric acid.
Claim 12
Dependent Claim
53 words
A polymer granulate as claimed in claim 1, which contains at most 30% by weight of constituents which are volatile at from 100° to 120° C. and wherein the core component has a particle size distribution in which D 10% is at most 0.9 mm and D 90% is at most 5 mm.
Claim 13
Dependent Claim
22 words
A polymer granulate as claimed in claim 11, wherein constituents which are volatile at from 100° to 120° C. are essentially water.
Claim 14
Dependent Claim
16 words
A polymer granulate as claimed in claim 12, wherein the coating component is a water-insoluble compound.
Claim 15
Dependent Claim
24 words
A polymer granulate as claimed in claim 12, wherein the coating component is a water-soluble compound which can form a complex with polyvinyl alcohol.
Claim 16
Dependent Claim
18 words
A polymer granulate according to claim 1, any essential non-solid constituent of which is volatile at 120° C.
Claim 17
Dependent Claim
24 words
A polymer granulate according to claim 1 wherein the core component is in granular gel form and contains, as dispersing medium, a lower alkanol.
Claim 18
Dependent Claim
28 words
In a method which comprises preparing an adhesive or a coating from a polymer, the improvement wherein the polymer is a polymer granulate as claimed in claim 12.
Claim 19
Dependent Claim
127 words
A process for preparing a polymer granulate, whose particles consist of from 50 to 98 per cent by weight of a core component and from 50 to 2 per cent by weight of a coating component, by mixing a granular polymer with a pulverulent substance at a temperature of from 15° to 30° C., which comprises coating granular water-soluble polyvinyl alcohol having particle diameters from 0.4 to 5 mm with a pulverulent substance having particle diameters from 0.01 to 1 mm in the presence of water in an amount of 10 to 20% by weight (based on the amount of water-soluble polyvinyl alcohol), the pulverulent substance being a member selected from the group consisting of boric acid, starch, a cellulose derivative, kaolin, silicon carbide and polyvinyl alcohol.
Claim 20
Dependent Claim
127 words
A process for preparing a polymer granulate, whose particles consist of from 50 to 98 per cent by weight of a core component and from 50 to 2 per cent by weight of a coating component, by mixing a granular polymer with a pulverulent substance at a temperature of from 15° to 30° C., which comprises coating granular water-soluble polyvinyl alcohol having particle diameters from 0.4 to 5 mm with a pulverulent substance having particle diameters from 0.01 to 1 mm in the presence of water in an amount of 10 to 20% by weight (based on the amount of water-soluble polyvinyl alcohol), the pulverulent substance being a member selected from the group consisting of boric acid, starch, a cellulose derivative, kaolin, silicon carbide and polyvinyl alcohol.
Claim 21
Dependent Claim
30 words
The process as claimed in claim 18, wherein the granular water-soluble polyvinyl alcohol is in the form of a gel which contains at least 85% by weight of polyvinyl alcohol.
Claim 22
Dependent Claim
15 words
The process as claimed in claim 18, which is carried out on a continuous basis.
Claim 23
Dependent Claim
25 words
A process as claimed in claim 18 wherein the granular polymer and the pulverulent substance are in a weight ratio of from 70:30 to 95:5.
Claim 24
Dependent Claim
29 words
A process as claimed in claim 18 which comprises mixing the core component and the coating component with each other for a period of from 10 to 30 minutes.
Claim 25
Dependent Claim
14 words
A process as claimed in claim 18 wherein the coating component is boric acid.
Claim 26
Dependent Claim
34 words
A process as claimed in claim 18, which wherein the core component have a particle size distribution in which D 10% is at most 0.9 mm and D 90% is at most 5 mm.
Claim 27
Dependent Claim
30 words
In a method for preparing an adhesive or coating material which comprises dissolving polymer in water, the improvement wherein the polymer is a polymer granulate as claimed in claim 12.
Claim 28
Dependent Claim
28 words
In a method which comprises preparing an adhesive or a coating from a polymer, the improvement wherein the polymer is a polymer granulate as claimed in claim 1.
Claim 29
Dependent Claim
22 words
A process according to claim 18 for preparing a polymer granulate, any essential non-solid constituent of which is volatile at 120° C.
References Cited (Backward Citations)
US2413570A
Cited
US2497346A
Cited
US2718471A
Cited
US3012900A
Cited
US3015572A
Cited
US4022749A
Cited
US3600342A
Cited
US3720633A
Cited
US3668166A
Cited
US4058124A
Cited
US4256805A
Cited
US4042529A
Cited
US4323492A
Cited
US4626472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |