US5475080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper having a melt-stable lactide polymer coating and process for manufacture thereof
Assignee: Cargill Inc
•
Filing: 1993-03-22
•
Granted: 1995-12-12
•
Expires: 2013-03-22
Abstract
Abstract A lactide polymer coating resulting in a strong, repulpable, high gloss, paper coating. The lactide polymer comprises a plurality of poly(lactide) polymer chains, residual lactide in concentration of less than about 5 percent and water in concentration of less than about 2000 parts-per-million. A process for coating paper with the lactide polymer composition is also disclosed.
Inventors
- 👤 Patrick R. Gruber
- 👤 Jeffrey J. Kolstad
- 👤 Christopher M. Ryan
- 👤 Eric S. Hall
- 👤 Robin S. Eichen Conn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:14
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/26; A61L31/00; A61L31/04; A61L31/06; C08G; C08G63/00; C08G63/02; C08G63/06; C08G63/08; C08G63/88; C08G63/90; C08L; C08L67/00; C08L67/04; C09; C09D; C09D167/00; C09D167/04; D; D01; D01F; D01F6/00; D01F6/58; D01F6/62; D01F6/625; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/28; D21H19/36; D21H19/44; D21H19/62; C08G2230/00; C08J2367/00; C08J2367/04; C08L101/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/3179; Y10T428/31801; Y10T428/31804; Y10T428/31808; Y10T428/31815; Y10T428/31819; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 53
Claim 1
Independent Claim
109 words
A paper product having a coating thereon, said coating formed from a melt stable lactide polymer composition comprising: i) a plurality of poly(lactide) polymer chains, said polymer chains being reaction products of polymerizing a lactide mixture comprising about 3 to about 50 percent by weight meso-lactide, with the remaining lactide being selected from the group consisting of L-lactide, D-lactide and mixtures thereof, said plurality having a number average molecular weight of from about 10,000 to about 200,000; ii) lactide in a concentration of less than about 5 percent by weight; and iii) water, if present at all, present in a concentration of less than about 2000 parts per million.
Claim 2
Dependent Claim
109 words
A paper product having a coating thereon, said coating formed from a melt stable lactide polymer composition comprising: i) a plurality of poly(lactide) polymer chains, said polymer chains being reaction products of polymerizing a lactide mixture comprising about 3 to about 50 percent by weight meso-lactide, with the remaining lactide being selected from the group consisting of L-lactide, D-lactide and mixtures thereof, said plurality having a number average molecular weight of from about 10,000 to about 200,000; ii) lactide in a concentration of less than about 5 percent by weight; and iii) water, if present at all, present in a concentration of less than about 2000 parts per million.
Claim 3
Dependent Claim
25 words
The paper product of claim 1 wherein said plurality of poly(lactide) polymer chains have a number average molecular weight from about 20,000 to about 175,000.
Claim 4
Dependent Claim
25 words
The paper product of claim 1 wherein said plurality of poly(lactide) polymer chains have a number average molecular weight from about 40,000 to about 150,000.
Claim 5
Dependent Claim
35 words
The paper product of claim 1 wherein said polymer chains are reaction products of polymerizing a lactide mixture comprising about 7 to about 50 percent by weight meso-lactide and the remaining lactide is substantially L-lactide.
Claim 6
Dependent Claim
35 words
The paper product of claim 1 wherein said polymer chains are reaction products of polymerizing a lactide mixture comprising about 10 to about 50 percent by weight meso-lactide and the remaining lactide is substantially L-lactide.
Claim 7
Dependent Claim
19 words
The paper product of claim 1 wherein said concentration of water is less than about 1000 parts per million.
Claim 8
Dependent Claim
19 words
The paper product of claim 1 wherein said concentration of water is less than about 300 parts per million.
Claim 9
Dependent Claim
21 words
The paper product of claim 1 wherein upon exposure to repulping processes, said paper product degrades and said poly(lactide) is recoverable.
Claim 10
Dependent Claim
15 words
The paper product of claim 1 wherein said polymer composition further comprises a stabilizing agent.
Claim 11
Dependent Claim
13 words
The paper product of claim 9 wherein said stabilizing agent is an antioxidant.
Claim 12
Dependent Claim
14 words
The paper product of claim 9 wherein said stabilizing agent is a water scavenger.
Claim 13
Dependent Claim
13 words
The paper product of claim 10, wherein said antioxidant comprises a phosphite-containing compound.
Claim 14
Dependent Claim
16 words
The paper product of claim 10, wherein said antioxidant comprises a hindered phenolic or phenolic compound.
Claim 15
Dependent Claim
55 words
The paper product of claim 10, wherein said antioxidant is selected from the group consisting of trialkyl phosphites, mixed alkyl/aryl phosphites, alkylated aryl phosphites, sterically hindered aryl phosphites, aliphatic spirocyclic phosphites, sterically hindered phenyl spirocyclics, sterically hindered bisphosphonites, hydroxyphenyl propionates, hydroxy benzyls, alkylidene bisphenols, alkyl phenols, aromatic amines, thioethers, hindered amines, hydroquinones and mixtures thereof.
Claim 16
Dependent Claim
27 words
The paper product of claim 11, wherein said water scavenger is selected from the group consisting of carbodiimides, anhydrides, acyl chlorides, isocyanates, alkoxy silanes and mixtures thereof.
Claim 17
Dependent Claim
34 words
The paper product of claim 1, wherein said water scavenger is a desiccant selected from the group consisting of clay, alumina, silica gel, zeolites, calcium chloride, calcium carbonates, sodium sulfate, bicarbonates and mixtures thereof.
Claim 18
Dependent Claim
58 words
The paper product of claim 1 wherein said polymer composition further comprises: iv) catalyst means for catalyzing the polymerization of lactide to form the poly(lactide) polymer chains, said catalyst means incorporated into the melt-stable lactide polymer composition during polymerization; and v) a catalyst deactivating agent in an amount sufficient to reduce catalytic depolymerization of said poly(lactide) polymer chains.
Claim 19
Dependent Claim
27 words
The paper product of claim 1 wherein said plurality of poly(lactide) polymer chains is the reaction product of polymerization at a temperature greater than about 160° C.
Claim 20
Dependent Claim
14 words
The paper product of claim 1 wherein said coating is applied in a solution.
Claim 21
Dependent Claim
12 words
The paper product of claim 1 wherein said coating is heat sealable.
Claim 22
Dependent Claim
32 words
The paper product of claim 20 wherein said coating is heat sealable in a time of less than about 1 second at a temperature of 300° F. and pressure of 60 psi.
Claim 23
Dependent Claim
14 words
The paper product of claim 1 wherein said polymer composition further comprises a plasticizer.
Claim 24
Dependent Claim
48 words
The paper product of claim 22 wherein said plasticizer is selected from the group consisting of alkyl phosphate esters, dialkylether diesters, tricarboxylic esters, epoxidized oils and esters, polymeric polyesters, polyglycol diesters, alkyl alkylether diesters, aliphatic diesters, alkylether monoesters, citrate esters, dicarboxylic esters, esters of glycerine and mixtures thereof.
Claim 25
Dependent Claim
14 words
The paper product of claim 1 wherein said polymer composition further comprises a filler.
Claim 26
Dependent Claim
44 words
The paper product of claim 24 wherein said filler is selected from the group consisting of cellulose, wheat, starch, modified starch, chitin, chitosan, keratin, cellulosic materials derived from agricultural products, gluten, nut shell flour, wood flour, corn cob flour, guar gum and mixtures thereof.
Claim 27
Dependent Claim
26 words
The paper product of claim 24 wherein said filler is selected from the group consisting of talc, silica, mica, kaolin, titanium dioxide, wollastonite and mixtures thereof.
Claim 28
Dependent Claim
15 words
The paper product of claim 1 wherein said polymeric composition further comprises a slip agent.
Claim 29
Dependent Claim
22 words
The paper product of claim 27 wherein said slip agent includes fluoropolymer powders, graphite, fatty acid esters, hydrocarbon waxes and mixtures thereof.
Claim 30
Dependent Claim
15 words
The paper product of claim 1 wherein said polymer composition further comprises an antistatic agent.
Claim 31
Dependent Claim
24 words
The paper product of claim 29 wherein said antistatic agent is selected from group consisting cationic surfactants, anionic surfactants, nonionic surfactants, and mixtures thereof.
Claim 32
Dependent Claim
14 words
The paper product of claim 1 wherein said polymer composition further comprises a pigment.
Claim 33
Dependent Claim
35 words
The paper product of claim 31 wherein said pigment is selected from the group consisting of titanium dioxide, clays, calcium carbonate, talc, mica, silica, iron oxide, iron hydroxide, carbon black, magnesium oxide and mixtures thereof.
Claim 34
Dependent Claim
131 words
A process for coating paper, said process comprising the steps of: a) providing a paper substrate to be coated, b) providing a melt-stable lactide polymer composition comprising: i) a plurality of poly(lactide) polymer chains, said plurality of polymer chains being reaction products of polymerizing a lactide mixture comprising about 3 to about 50 percent by weight meso-lactide, with the remaining lactide being selected from the group consisting of L-lactide, D-lactide and mixtures thereof, said plurality of polymer chains having a number average molecular weight of about 10,000 to about 200,000; ii) lactide in a concentration of less than about 5 percent by weight; and iii) water, if present at all, present in a concentration of less than about 2000 parts per million; and c) coating said polymer composition onto said substrate.
Claim 35
Dependent Claim
131 words
A process for coating paper, said process comprising the steps of: a) providing a paper substrate to be coated, b) providing a melt-stable lactide polymer composition comprising: i) a plurality of poly(lactide) polymer chains, said plurality of polymer chains being reaction products of polymerizing a lactide mixture comprising about 3 to about 50 percent by weight meso-lactide, with the remaining lactide being selected from the group consisting of L-lactide, D-lactide and mixtures thereof, said plurality of polymer chains having a number average molecular weight of about 10,000 to about 200,000; ii) lactide in a concentration of less than about 5 percent by weight; and iii) water, if present at all, present in a concentration of less than about 2000 parts per million; and c) coating said polymer composition onto said substrate.
Claim 36
Dependent Claim
33 words
The process of claim 33 wherein said step of coating includes melt extruding said polymer composition at sufficient temperature to form a liquid coating onto said substrate; and allowing said liquid to solidify.
Claim 37
Dependent Claim
24 words
The process of claim 33 wherein said plurality of poly(lactide) polymer chains have a number average molecular weight of about 20,000 to about 175,000.
Claim 38
Dependent Claim
24 words
The process of claim 33 wherein said plurality of poly(lactide) polymer chains have a number average molecular weight from about 40,000 to about 150,000.
Claim 39
Dependent Claim
34 words
The process of claim 33 wherein said polymer chains are reaction products of polymerizing a lactide mixture comprising about 10 to about 50 percent by weight meso-lactide and the remaining lactide is substantially L-lactide.
Claim 40
Dependent Claim
18 words
The process of claim 33 wherein said concentration of water is less than about 1000 parts per million.
Claim 41
Dependent Claim
18 words
The process of claim 33 wherein said concentration of water is less than about 300 parts per million.
Claim 42
Dependent Claim
33 words
The process of claim 33 wherein said polymer chains are reaction products of polymerizing a lactide mixture comprising at least about 3 percent by weight meso-lactide and the remaining lactide is substantially L-lactide.
Claim 43
Dependent Claim
14 words
The process of claim 33 wherein said polymer composition further comprises a stabilizing agent.
Claim 44
Dependent Claim
12 words
The process of claim 33 wherein said stabilizing agent is an antioxidant.
Claim 45
Dependent Claim
13 words
The process of claim 41 wherein said stabilizing agent is a water scavenger.
Claim 46
Dependent Claim
12 words
The process of claim 42 wherein said antioxidant is a phosphite-containing compound.
Claim 47
Dependent Claim
15 words
The process of claim 42 wherein said antioxidant is a hindered phenolic or phenolic compound.
Claim 48
Dependent Claim
54 words
The process of claim 42 wherein said antioxidant is selected from the group consisting of trialkyl phosphites, mixed alkyl/aryl phosphites, alkylated aryl phosphites, sterically hindered aryl phosphites, aliphatic spirocyclic phosphites, sterically hindered phenyl spirocyclics, sterically hindered bisphosphonites, hydroxyphenyl propionates, hydroxy benzyls, alkylidene bisphenols, alkyl phenols, aromatic amines, thioethers, hindered amines, hydroquinones and mixtures thereof.
Claim 49
Dependent Claim
26 words
The process of claim 43 wherein said water scavenger is selected from the group consisting of carbodiimides, anhydrides, acyl chlorides, isocyanates, alkoxy silanes and mixtures thereof.
Claim 50
Dependent Claim
33 words
The process of claim 43 wherein said water scavenger is a desiccant selected from the group consisting of clay, alumina, silica gel, zeolites, calcium chloride, calcium carbonates, sodium sulfate, bicarbonates and mixtures thereof.
Claim 51
Dependent Claim
57 words
The process of claim 33, wherein said polymer composition further comprises: (iv) catalyst means for catalyzing the polymerization of lactide to form the poly(lactide) polymer chains, said catalyst means incorporated into the melt-stable lactide polymer composition during polymerization; and (v) a catalyst deactivating agent in an amount sufficient to reduce catalytic depolymerization of said poly(lactide) polymer chains.
Claim 52
Dependent Claim
27 words
The process of claim 33 wherein said plurality of poly(lactide) polymer chains are the reaction products of polymerization at a temperature of greater than about 160° C.
Claim 53
Dependent Claim
20 words
The process of claim 33 wherein said step of coating includes applying said polymer composition to said substrate in solution.
References Cited (Backward Citations)
CA808731A
Cited
CA863673A
Cited
DE267826C
Cited
US1095205A
Cited
US1849107A
Cited
US1995970A
Cited
US2396994A
Cited
US2703316A
Cited
US2758987A
Cited
US2951828A
Cited
DE1083275B
Cited
US3322791A
Cited
GB1040168A
Cited
US3268487A
Cited
US3531561A
Cited
DE1543958A1
Cited
GB1108720A
Cited
US3772420A
Cited
US3887699A
Cited
US3773919A
Cited
CA923245A
Cited
US3636956A
Cited
GB1351409A
Cited
US3839297A
Cited
US3912692A
Cited
US4045418A
Cited
US4279249A
Cited
US4249531A
Cited
US4273920A
Cited
EP0052510A2
Cited
EP0107591A2
Cited
US4643734A
Cited
GB2145422A
Cited
US4677191A
Cited
US4683288A
Cited
US4595713A
Cited
US4728721A
Cited
US4727163A
Cited
US4789726A
Cited
DE3632103A1
Cited
US4990222A
Cited
US4960866A
Cited
US4797468A
Cited
US4800219A
Cited
US4766182A
Cited
US4981696A
Cited
US4719246A
Cited
US4835293A
Cited
US5053522A
Cited
US4983745A
Cited
EP0299730A2
Cited
EP0314245A1
Cited
US5053485A
Cited
US4950258A
Cited
US4902515A
Cited
US5180765A
Cited
WO1990001521A1
Cited
US5108399A
Cited
US5041529A
Cited
US5011946A
Cited
US5149833A
Cited
WO1991002015A1
Cited
WO1991006601A1
Cited
WO1991013207A1
Cited
US5043458A
Cited
WO1991017155A1
Cited
US5023349A
Cited
US5097005A
Cited
US5023350A
Cited
WO1992000292A1
Cited
US5076983A
Cited
US5134171A
Cited
WO1992004413A1
Cited
WO1992004410A1
Cited
WO1992005168A1
Cited
WO1992005167A1
Cited
EP0481732A1
Cited
US5136017A
Cited
JPH04283227A
Cited
EP0507554A1
Cited
US5132397A
Cited
EP0510998A2
Cited
EP0515203A2
Cited
WO1993002075A1
Cited
US5296282A
Cited
US5142023A
Cited
US5338822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |