EP0694874A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Biodegradable cards
Assignee: Toppan Inc
•
Filing: 1995-07-21
•
Granted: —
•
Expires: 2015-07-21
Abstract
Abstract A biaxially oriented sheet of a biodegradable thermoplastic resin composition containing a lactic acid polymer is used as a structural material for a supporting substrate (2) of a biodegradable card (1). The lactic acid polymer has a number average molecular weight of from 10,000 to 1,000,000. The thermoplastic resin composition may preferably be mixed with a modifying biodegradable resin. In another embodiment, the biaxially oriented sheet of the biodegradable thermoplastic resin composition may preferably be covered with the modifying biodegradable resin. The biodegradable lactic acid polymer or the modifying biodegradable resin is also used as a polymeric binder of an information recording layer (3) provided on the surface of the supporting substrate (2).
Inventors
- 👤 Nagahisa Matsudaira
- 👤 Toshibumi Imai
- 👤 Li Han Sen
- 👤 Masayuki Taniguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 16:10
CPC Classifications
G; G06; G06K; G06K19/00; G06K19/02; C; C08; C08L; C08L67/00; C08L67/04; C08L67/02; C08L75/00; C08L75/04; C08L75/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T428/31786
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
23 words
A biodegradable card comprising a supporting substrate comprising a biaxially oriented sheet of a biodegradable thermoplastic resin composition containing a lactic acid polymer.
Claim 2
Dependent Claim
23 words
The biodegradable card according to claim 1, wherein said lactic acid polymer has a number average molecular weight of from 10,000 to 1,000,000.
Claim 3
Dependent Claim
24 words
The biodegradable card according to claim 1 or 2, wherein said thermoplastic resin composition further contains an aliphatic polyester resin having a hydroxyalkanoate unit.
Claim 4
Dependent Claim
76 words
The biodegradable card according to claim 1 or 2, wherein said thermoplastic resin composition contains a polyester polyurethane resin with a number average molecular weight of from 10,000 to 100,000, represented by Formula (1): wherein n represents a degree of polymerization; p represents a number of 0 or 1 or more; R¹ and R² each independently represent a divalent hydrocarbon group having 2 to 10 carbon atoms; and R³ represents a di- or poly-isocyanate residual group.
Claim 5
Dependent Claim
56 words
The biodegradable card according to claim 1 or 2, wherein said thermoplastic resin composition contains a polyester resin with a number average molecular weight of from 25,000 to 70:000, represented by Formula (2): wherein q represents a degree of polymerization, and R¹¹ and R¹² each represent a divalent hydrocarbon group having 2 to 10 carbon atoms.
Claim 6
Dependent Claim
44 words
The biodegradable card according to claim 1 or 2, wherein said thermoplastic resin composition contains a polycaprolactone resin with a number average molecular weight of from 10,000 to 100,000, having a polymer unit represented by Formula (3): wherein m represents a degree of polymerization.
Claim 7
Dependent Claim
51 words
The biodegradable card according to claim 1 or 2, wherein said supporting substrate comprises the biaxially oriented sheet of the biodegradable thermoplastic resin composition and a biodegradable coat layer laminated to at least one side of the sheet; said biodegradable coat layer containing an aliphatic polyester resin having a hydroxyalkanoate unit.
Claim 8
Dependent Claim
104 words
The biodegradable card according to claim 1 or 2, wherein said supporting substrate comprises the biaxially oriented sheet of the biodegradable thermoplastic resin composition and a biodegradable coat layer laminated to at least one side of the sheet; said biodegradable coat layer containing a polyester polyurethane resin with a number average molecular weight of from 10,000 to 100,000, represented by Formula (1): wherein n represents a degree of polymerization; p represents a number of 0 or 1 or more; R¹ and R² each independently represent a divalent hydrocarbon group having 2 to 10 carbon atoms; and R³ represents a di- or poly-isocyanate residual group.
Claim 9
Dependent Claim
84 words
The biodegradable card according to claim 1 or 2, wherein said supporting substrate comprises the biaxially oriented sheet of the biodegradable thermoplastic resin composition and a biodegradable coat layer laminated to at least one side of the sheet; said biodegradable coat layer containing a polyester resin with a number average molecular weight of from 25,000 to 70,000, represented by Formula (2): wherein q represents a degree of polymerization, and R¹¹ and R¹² each represent a divalent hydrocarbon group having 2 to 10 carbon atoms.
Claim 10
Dependent Claim
72 words
The biodegradable card according to claim 1 or 2, wherein said supporting substrate comprises the biaxially oriented sheet of the biodegradable thermoplastic resin composition and a biodegradable coat layer laminated to at least one side of the sheet; said biodegradable coat layer containing a polycaprolactone resin with a number average molecular weight of from 10,000 to 100,000, having a polymer unit represented by Formula (3): wherein m represents a degree of polymerization.
Claim 11
Dependent Claim
28 words
The biodegradable card according to any one of claims 1 to 10, wherein an information recording layer containing a biodegradable polymeric binder is formed on said supporting substrate.
Claim 12
Dependent Claim
50 words
The biodegradable card according to claim 11, wherein said polymeric binder contains a polycaprolactone resin or a lactic acid polymer; said polycaprolactone resin having a number average molecular weight of from 10,000 to 100,000 and having a polymer unit represented by Formula (3): wherein m represents a degree of polymerization.
Claim 13
Dependent Claim
23 words
The biodegradable card according to claim 12, wherein said lactic acid polymer has a number average molecular weight of from 10,000 to 1,000,000.
Claim 14
Dependent Claim
27 words
The biodegradable card according to claim 12 or 13, wherein said polycaprolactone resin in the polymeric binder is in a content not less than 20% by weight.
References Cited (Backward Citations)
US199597A
Cited
US2362511A
Cited
US2683136A
Cited
US3636956A
Cited
US3797449A
Cited
JPS5193991A
Cited
JPS57150393A
Cited
JPS5996123A
Cited
JPS59220192A
Cited
JPS62289020A
Cited
JPS63260912A
Cited
JPH04122205A
Cited
JPH04189822A
Cited
JPH0542786A
Cited
JPH0585088A
Cited
JPH079788A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.