US4880870A
Expired / Lapsed
US
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Polymer granulate, a process for its preparation, and its use
Assignee: Hoechst AG
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Filing: 1985-07-30
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Granted: 1989-11-14
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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 08:31
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.
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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 |