Stock material or miscellaneous articles – Composite – Of silicon containing
Reexamination Certificate
1999-10-25
2002-08-27
Dawson, Robert (Department: 1712)
Stock material or miscellaneous articles
Composite
Of silicon containing
C525S106000, C525S431000, C525S446000, C525S100000
Reexamination Certificate
active
06440572
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a novel compound. Said novel compound is useful as paint used in a field wherein weatherability and lubricancy are necessary, such as paint to prevent sticking ice or snow, paint to prevent attaching of paper and the like. Further said novel compound is useful as a coating agent giving the surface of plastic film such as polyvinyl chloride film, polyester film and the like or the surface of carrier or base such as paper used for electronic photograph, water repellency, lubricancy, heat resistance and the like. Still further said novel compound is useful as a sticking proof agent used as heat sensitive transfer recording media. Further the present invention relates to a sticking proof agent and a heat sensitive transfer recording film using said novel compound.
PRIOR ART
Hitherto, silicone paint has been used as paint to prevent sticking ice or snow, paint to prevent attaching of paper and the like. Further iron powder, ferrite powder and the like used in electronic photograph have been treated with a coating agent to give environment resistance, durability, wear resistance and the like. Still further the surface of plastic film such as polyethylene terephthalate (PET) film, polyethylene naphthalate (PEN) film, and the like used as the base of a magnetic recording tape, heat sensitive transfer ink ribbon, and the like have been treated with a coating agent to give water repellency, lubricancy, heat resistance, and the like.
Mainly, a compound containing reactive silicone, polydimethylsiloxane oil and the like has been used as said coating agent.
Nevertheless, said compound containing reactive silicone, polydimethylsiloxane oil and the like has problems in that coating film of said compound has a low adhesiveness and a low transparency and has stickiness on its surface. Further said coating film has a poor effectiveness to give the surface of base water repellency, lubricancy, heat resistance and the like, and durability of said effectiveness is also insufficient.
On the other hand, heat sensitive transfer recording film consists of a base film and a heat sensitive ink layer formed on one side of said base film and said heat sensitive transfer recording film is used to form a recording picture on the recording paper by attaching the heat sensitive ink layer of said heat sensitive transfer recording film to the recording paper, generating a pulse signal from the thermal head arranged in the opposite side to the said heat sensitive ink layer to heat selected portion of said heat sensitive ink layer, said heated portion of said heat sensitive ink layer is melted or sublimated to transfer to the recording paper.
Said heat sensitive transfer recording system has advantages in that no noise is generated during printing and a recording picture has an excellent heat resistance, an excellent water resistance, an excellent chemical resistance, an excellent plasticizer resistance, an excellent preservativeness and the like. While said heat sensitive transfer recording system has faults in that the base film is partially melted by a high temperature of the thermal head and said melted base film sticks to the thermal head resulting in an obstacle in conveying the heat sensitive transfer recording film and obstructing transcription from the heat sensitive ink layer of the heat sensitive transfer recording film to the recording paper.
To solve the above mentioned sticking problems, a sticking proof layer is formed on the thermal head side of said base film.
Hitheroto, a metal layer such as an aluminum layer and the like, a coating layer of lubricant such as silicone, paraffin and the like, a thermosetting resin layer such as polyurethane resin, epoxy resin, melamine resin and the like, cellulose derivative such as ethylcellulose and the like have been provided as said sticking proof layer.
Nevertheless, said traditional sticking proof layer has a poor ability to prevent sticking and long curing time at a high temperature is necessary for said thermosetting resins resulting in poor workability and poor practical use and further in the case where said sticking proof layer has a good sticking proof ability, said sticking proof layer has poor adhesiveness to the base film.
To solve the above mentioned problems, the graft copolymer layer, which has polydimethyl siloxane as branch, has been provided as a sticking proof layer (Tokkai Hei No. 1-214475).
Nevertheless, since said sticking proof layer consisting of only said graft copolymer has poor adhesiveness to the base film and poor wear resistance, and further poor mechanical strength such as tensile strength and the like, resulting in peeling of a sticking proof layer attached to the thermal head (head refuse).
MEANS OF SOLVING THE PROBLEMS
To solve said traditional problems, the present invention provides a compound containing polydimethylsiloxane copolymer (A) and the second component (B) that is one or more synthetic resin(s) (B-1) selected from a group consisting of polyvinyl acetate derivatives, polyamide, acrylic resin, epoxy resin, unsaturated polyester resin and precursor of unsaturated polyester, and/or cellulose derivatives (B-2); an anti-sticking agent containing said compound; and further a heat sensitive transfer recording film comprising a base film wherein a heat sensitive ink layer is formed on one side of said film and anti-sticking layer containing polydimethylsiloxane copolymer (A) and the second component (B) that is one or more synthetic resin(s) (B-1) selected from a group consisting of polyvinyl acetate derivatives, polyamide, acrylic resin, epoxy resin, unsaturated polyester resin and precursor of unsaturated polyester, and/or cellulose derivatives (B-2).
Desirable polydimethylsiloxane copolymer in the present invention is block type copolymer, especially block type copolymer produced by polymerization of vinyl monomer using polydimethylsiloxane amide containing an azo group as an initiator.
DESCRIPTION OF THE EMBODIMENTS
Detailed description of the present invention is as follows.
[Polydimethylsiloxane Copolymer (A)]
Polydimethylsiloxane copolymer (A) used in a sticking proof layer of sticking proof agents or heat sensitive transfer recording film may be graft type copolymer or block type copolymer. Nevertheless by using block type polydimethylsiloxane copolymer, repelling of coated heat sensitive ink caused by the transfer of unreacted silicone to the reverse side of the base film on which said heat sensitive ink is to be coated and transfer inferiority caused by the transfer of unreacted silicone to the heat sensitive ink the layer of the resulting heat sensitive transfer recording film during storage are prevented.
Graft type polydimethylsiloxane copolymer (A-1) may be produced by copolymerization of graft type reactive silicone and vinyl monomer which can copolymerize with said reactive silicone by applying such as the macromonomer method.
Said graft type reaction silicone is a reactive silicone having an unsaturated double bond on its one end such as;
[chemical formula:1]
[chemical formula:2]
As the vinyl monomer that can be copolymerized with the above reactive silicone, for example, aliphatic or cyclic acrylate and/or methacrylate such as methylacrylate, ethylacrylate, n-propylacrylate, isopropylacrylate, n-butyl aery late, isobutylacrylate, t-butylacrylate, 2-ethylhexylacrylate, cyclohexylacrylate, tetrahydrofurfurylacrylate, stearylacrylate, laurylacrylate, methylmethacrylate, ethylmethacrylate, n-propylmethacrylate, isopropylmethacrlylate, n-butylmethacrylate, isobutylmethacrylate, 2-ethylbexylmethacrylate, cyclohexylmethacrylate, tetrahydrofurfurylmethacrylate, stearylmethacrylate, laurylmethacrylate and the like; the vinylether group such as methyvinylether, ethylvinylether, n-propyl vinylether, n-butylvinylether, isobutylvinylether and the like; the styrene group such as styrene, &agr;-methylstyrene and the like; nitril monomer such as acrylonitril, metacrylonitril and the like; vinyl fatty ester such as vinylacetate, vinylp
Hata Hironori
Yokoyama Norio
Cooper & Dunham LLP
Dawson Robert
Dowden Donald S.
Natoco Paint Co., Ltd.
Zimmer Marc S.
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