Polymer coating composition for metal substrate and use thereof
AssigneeTata Steel Ijmuiden B.V.
InventorsJohannes Willem Pattiasina, Jan Paul Penning
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Abstract
A polymer film for laminating onto a metal substrate (M), the polymer film including an adhesion layer (A) and a bulk layer (B), wherein the adhesion layer is intended for bonding to the metal substrate and includes 20 to 50 wt. % of a non-crystallisable copolyester, 50 to 80 wt. % of polybutylene terephthalate (PBT) and 0-10 wt. % of polymers and additives, and wherein the bulk layer consists of is at least 91 wt. % of PBT and at most 9% of other polymers and additives.
Claims20
A polymer film for laminating onto a packaging steel substrate, the polymer film comprising an adhesion layer and a bulk layer,
- wherein the adhesion layer is intended for bonding to the metal substrate and comprises:
- 20 to 50 wt. % of a non-crystallisable copolyester comprising polyethylene terephthalate modified by copolymerization,
- 50 to 80 wt. % of polybutylene terephthalate (PBT) and 0-10 wt. % of polymers and additives, and
- wherein the bulk layer consists of at least 91 wt. % of PBT and at most 9% of other polymers and additives,
- wherein the non-crystallisable polyester is added only to the adhesion layer contacting the metal substrate,
- wherein the adhesion layer has an absence of polyethylene terephthalate (PET) homopolymer,
- further comprising a top layer on top of the bulk layer,
- wherein the top layer consists of at least 95 wt. % of PBT, and at most 5% of other polymers and additives,
- wherein the polymer film is machine direction oriented, transverse direction oriented, or biaxially oriented.
A polymer film for laminating onto a packaging steel substrate, the polymer film comprising an adhesion layer and a bulk layer,
- wherein the adhesion layer is intended for bonding to the metal substrate and comprises:
- 20 to 50 wt. % of a non-crystallisable copolyester comprising polyethylene terephthalate modified by copolymerization,
- 50 to 80 wt. % of polybutylene terephthalate (PBT) and 0-10 wt. % of polymers and additives, and
- wherein the bulk layer consists of at least 91 wt. % of PBT and at most 9% of other polymers and additives,
- wherein the non-crystallisable polyester is added only to the adhesion layer contacting the metal substrate,
- wherein the adhesion layer has an absence of polyethylene terephthalate (PET) homopolymer,
- further comprising a top layer on top of the bulk layer,
- wherein the total PBT content in the film is at least 88 wt. % and wherein the top layer consists of at least 98 wt. % of PBT and at most 2% of other polymers and additives.
Dependencies are inferred from the claim text.