Claims
- 1. A process for producing a resin-coated steel sheet for DI cans, comprising:
- providing a mixture containing 95 to 5% by weight of a crystalline polyester resin and 5 to 95% by weight of a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b), of 5 to 50% where (a) and (b) are as follows: ##EQU2## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto a chromate-treated side of a steel sheet, which is tin-coated on the other side, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property; and
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin.
- 2. A process for producing a resin-coated steel sheet for DI cans, comprising:
- providing a mixture containing 95 to 5% by weight of a crystalline polyester resin and 5 to 95% by weight of a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b) below, of 20 to 80% where (a) and (b) are as follows: ##EQU3## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto one side of a steel sheet which is tin-coated on both sides, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property; and
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin.
- 3. A process for producing a resin-coated steel sheet for DI cans, comprising:
- providing a mixture containing a crystalline polyester resin and a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b) below, of greater than 0% and less than 50% where (a) and (b) are as follows: ##EQU4## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C. of the thermoplastic polyester resin;
- providing a steel sheet which is tin-coated on both sides and wherein one side is further coated with a non-crystalline polyester resin layer;
- coating the thermoplastic polyester resin by means of a T-die onto the non-crystalline polyester resin layer, wherein said thermoplastic polyester resin as applied on said layer is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property; and
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin.
- 4. A process for producing a resin-coated steel sheet for DI cans, comprising:
- providing a mixture containing a crystalline polyester resin and a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b) below, of not less than 50% and less than 100% where (a) and (b) are as follows: ##EQU5## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C. of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C. of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C. of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto one side of a steel sheet which is tin-coated on both sides, and further coating the coated thermoplastic polyester resin by means of a T-die with a second crystalline polyester resin, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property; and
- cooling the coated resins quickly to prevent further crystallization of the thermoplastic polyester resin.
- 5. A process for producing a drawn and ironed can, comprising:
- providing a mixture containing 95 to 5% by weight of a crystalline polyester resin and 5 to 95% by weight of a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by formulas (a) or (b) below, of 5 to 50% where (a) and (b) are as follows: ##EQU6## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto a chromate-treated side of a steel sheet, which is tin-coated on the other side, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property;
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin; and
- drawing and ironing the resultant resin-coated steel sheet to from a can, with the resin-coated side of the steel sheet forming the inside of the can.
- 6. A process for producing a drawn and ironed can, comprising:
- providing a mixture containing 95 to 5% by weight of a crystalline polyester resin and 5 to 95% by weight of a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b) below, of 20 to 80% where (a) and (b) are as follows: ##EQU7## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin a having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto one side of a steel sheet which is tin-coated on both sides, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property;
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin; and
- drawing and ironing the resultant resin-coated steel sheet to from a can, with the resin-coated side of the steel sheet forming the inside of the can.
- 7. A process for producing a drawn and ironed can, comprising:
- providing a mixture containing a crystalline polyester resin and a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) or (b) below, of greater than 0% and less than 50% where (a) and (b) are as follows: ##EQU8## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and the glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- providing a steel sheet which is tin-coated on both sides and wherein one side is further coated with a non-crystalline polyester resin layer;
- coating the thermoplastic polyester resin by means of a T-die onto the non-crystalline polyester resin layer, wherein said thermoplastic polyester resin as applied on said layer is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property;
- cooling the coated resin quickly to prevent further crystallization of the thermoplastic polyester resin; and
- drawing and ironing the resultant resin-coated steel sheet to from a can, with the resin-coated side of the steel sheet forming the inside of the can.
- 8. A process for producing a drawn and ironed can, comprising:
- providing a mixture containing a crystalline polyester resin and a non-crystalline polyester resin;
- reacting said resins, by means of thermal fusion, to produce a thermoplastic polyester resin having an alloying ratio, as represented by one of formulas (a) and (b) below, of not less than 50% and less than 100% where (a) and (b) are as follows: ##EQU9## where T.sub.m1 and T.sub.g1 are respectively the melting point and the glass-transition temperature, in .degree. C., of the crystalline polyester resin, T.sub.m2 and T.sub.g2 are respectively the melting point and the glass-transition temperature, in .degree. C., of a random copolymer of a polyester resin having a monomer composition equal to that of the thermoplastic polyester resin, T.sub.m3 and T.sub.g3 are respectively the melting point and a glass-transition temperature, in .degree. C., of the thermoplastic polyester resin;
- coating the thermoplastic polyester resin by means of a T-die onto one side of a steel sheet which is tin-coated on both sides, and further coating the coated thermoplastic polyester resin by means of a T-die with a second crystalline polyester resin, wherein said thermoplastic polyester resin as applied on the steel sheet is in non-crystalline condition and is to be converted by DI working into a crystalline resin layer to assure a satisfactory stripping-out property;
- cooling the coated resins quickly to prevent further crystallization of the thermoplastic polyester resin; and
- drawing and ironing the resultant resin-coated steel sheet to form a can, with the resin-coated side of the steel sheet forming the inside of the can.
Priority Claims (3)
Number |
Date |
Country |
Kind |
1-296450 |
Nov 1989 |
JPX |
|
2-120408 |
May 1990 |
JPX |
|
2-120409 |
May 1990 |
JPX |
|
Parent Case Info
This application is a division of application, Ser. No. 08/210,747, filed Mar. 18, 1994, now U.S. Pat. No. 5,714,273, which is a continuation of now abandoned application, Ser. No. 07/875,593, filed Apr. 28, 1992, which is a continuation of now abandoned application, Ser. No. 07/612,440, filed Nov. 14, 1990.
US Referenced Citations (6)
Foreign Referenced Citations (5)
Number |
Date |
Country |
2431076 |
Jan 1975 |
DEX |
59-76226 |
May 1984 |
JPX |
2055687 |
May 1981 |
GBX |
2181104 |
Apr 1987 |
GBX |
8903304 |
Apr 1989 |
GBX |
Non-Patent Literature Citations (4)
Entry |
Metal Finishing Guidebook Directory, 43.sup.rd Annual Edition, pp. 510-513, 1975. |
Mitchel Sehn and Hirumichi Kawai, "Properties and Structure of Polymeric Alloys", AlChE Journ., vol. 24, #1, Jan. 1978. |
Miura et al., Chemical Abstracts, vol. No. 82, Item No. 157925w, 1975. |
World Patent Index, Abstract of JP 1145137A, AN No. 89-209344, 1989. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
210747 |
Mar 1994 |
|
Continuations (2)
|
Number |
Date |
Country |
Parent |
875593 |
Apr 1992 |
|
Parent |
612440 |
Nov 1990 |
|