US4011359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interleaving materials comprising particulate separator and acidic materials, for separating glass sheets
Assignee: Pilkington Group Ltd
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Filing: 1975-04-22
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Granted: 1977-03-08
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Expires: 1995-04-22
Abstract
Abstract An interleaving material for separating glass sheets and protecting them from scratching and staining during storage or transit comprises a porous finely divided support material, such as wood flour, impregnated with a weakly acidic material such as an organic acid (e.g. adipic acid) or an acid reacting salt, and fine particles of a chemically inert plastics material, e.g. a methyl methacrylate, preferably of slightly larger particle size than the acid-impregnated support material.
Inventors
- 👤 Gordon Thomas Simpkin
- 👤 Kenneth Ashcroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:25
CPC Classifications
B; B65; B65D; B65D85/00; B65D85/30; B65D85/48; B65G; B65G49/00; B65G49/05; B65G49/06; B65G49/068; B65G49/069; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/253; Y10T428/254; Y10T428/31504; Y10T428/31551; Y10T428/31634; Y10T428/31645
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
148 words
An interleaving material for separating glass sheets and protecting them from staining, comprising a porous finely divided support material, impregnated with a weak organic acid selected from the group consisting of dibasic aliphatic acids, aromatic acids and mixtures thereof, and fine particles of a chemically inert plastics material selected from the group consisting of a thermoplastic homopolymer of an ethylenically unsaturated monomer, a thermoplastic copolymer of ethylenically unsaturated monomers and mixtures thereof, the particle size of said plastics material being larger than that of said acid-impregnated porous support material and the particle sizes of both said plastics material and said support material being such that the particles will pass through a 10 mesh British Standard sieve but will be retained on a 300 mesh British Standard sieve, said plastics material and said acid-impregnated porous support material being present in relative proportions between 90:10 and 10:90 parts by weight.
Claim 2
Dependent Claim
148 words
An interleaving material for separating glass sheets and protecting them from staining, comprising a porous finely divided support material, impregnated with a weak organic acid selected from the group consisting of dibasic aliphatic acids, aromatic acids and mixtures thereof, and fine particles of a chemically inert plastics material selected from the group consisting of a thermoplastic homopolymer of an ethylenically unsaturated monomer, a thermoplastic copolymer of ethylenically unsaturated monomers and mixtures thereof, the particle size of said plastics material being larger than that of said acid-impregnated porous support material and the particle sizes of both said plastics material and said support material being such that the particles will pass through a 10 mesh British Standard sieve but will be retained on a 300 mesh British Standard sieve, said plastics material and said acid-impregnated porous support material being present in relative proportions between 90:10 and 10:90 parts by weight.
Claim 3
Dependent Claim
16 words
A material according to claim 1 wherein the organic acid contains 3 to 10 carbon atoms.
Claim 4
Dependent Claim
13 words
A material according to claim 1, wherein the organic acid is adipic acid.
Claim 5
Dependent Claim
13 words
A material according to claim 1, wherein the organic acid is maleic acid.
Claim 6
Dependent Claim
13 words
A material according to claim 1, wherein the organic acid is sebacic acid.
Claim 7
Dependent Claim
13 words
A material according to claim 1, wherein the organic acid is succinic acid.
Claim 8
Dependent Claim
13 words
A material according to claim 1, wherein the organic acid is benzoic acid.
Claim 9
Dependent Claim
18 words
A material according to claim 1, wherein the porous support material is a cellulose material of vegetable origin.
Claim 10
Dependent Claim
15 words
A material according to claim 8, wherein the porous support material is coconut shell flour.
Claim 11
Dependent Claim
15 words
A material according to claim 8, wherein the porous support material is a wood flour.
Claim 12
Dependent Claim
15 words
A material according to claim 10, wherein the wood flour is a hardwood wood flour.
Claim 13
Dependent Claim
31 words
A material according to claim 1, wherein the porous support material and the plastics material both have a particle size such that they will pass a 30 mesh (British Standard) sieve.
Claim 14
Dependent Claim
27 words
A material according to claim 12, wherein the acidimpregnated porous support material has a particle size such that it will pass a 120 mesh (British Standard) sieve.
Claim 15
Dependent Claim
12 words
A material according to claim 1, wherein the plastics material is polyethylene.
Claim 16
Dependent Claim
12 words
A material according to claim 1, wherein the plastics material is polystyrene.
Claim 17
Dependent Claim
12 words
A material according to claim 1, wherein the plastics material is polytetrafluoroethylene.
Claim 18
Dependent Claim
15 words
A material according to claim 1, wherein the plastics material is a methacrylate ester polymer.
Claim 19
Dependent Claim
14 words
A material according to claim 17, wherein the plastics material is a methylmethacrylate polymer.
Claim 20
Dependent Claim
28 words
A material according to claim 1, wherein the acid-impregnated porous support material and the chemically inert plastics material are mixed in proportions of substantially 50:50 parts by weight.
Claim 21
Dependent Claim
29 words
A material according to claim 1, wherein the porous support material is coconut shell flour which is impregnated with between 5 and 20 parts by weight of adipic acid.
Claim 22
Dependent Claim
50 words
A process for protecting sheets of glass from scratching and staining during storage or transport, comprising applying an interleaving material according to claim 1 to a major surface of one such sheet of glass and bringing a further sheet of glass into face to face relation with said major surface.
Claim 23
Dependent Claim
32 words
A method of producing a stack of glass sheets, protected from scratching and staining by an interleaving material between the sheets, comprising repeating the process of claim 21 to form the stack.
Claim 24
Dependent Claim
13 words
A stack of glass sheets produced by the method according to claim 22.
Claim 25
Dependent Claim
42 words
A stack of glass sheets comprising a plurality of glass sheets in face to face relationship, the major surfaces of adjacent sheets in the stack being protected from scratching and staining by being separated by an interleaving material according to claim 1.
Claim 26
Dependent Claim
36 words
A material according to claim 1, wherein said weak organic acid has a first dissociation constant, measured at 25° C, in the range of 1 × 10 - 1 to 1 × 10 - 7 .
References Cited (Backward Citations)
GB861578A
Cited
US3723312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |