Toyobo: Patent Issued for Polyester Resin Composition for Electrical/Electronic Part-Sealing Material, Sealed Product, and Production Method
Resource from: 4 Traders Likes:228
Jul 29,2015
TOYOBO CO., LTD. (Osaka, JP) has been issued patent number 9080091, according to news reporting originating out of Alexandria, Virginia, by VerticalNews editors.
The patent's inventors are Sakai, Junko (Otsu, JP); Shiga, Kenji (Otsu, JP).
This patent was filed on February 21, 2012 and was published online on July 14, 2015.
From the background information supplied by the inventors, news correspondents obtained the following quote: "Use of a polyester polyether-type elastomer having a crystalline polyester such as polybutylene terephthalate (PBT) and polybutylene naphthalate (PBN) as a hard segment and a long chain aliphatic polyether polyol with a low glass transition temperature (Tg) such as polytetramethylene glycol (PTMG) as a soft segment for an electronic sealing material as a soft segment has been previously known (e.g., Patent Document 1) and the elastomer has already been practically used. However, since the ether bonds in the long chain aliphatic polyester polyol are susceptible to heat decomposition and hydrolysis, the elastomer is limited in its heat resistance, resistance to thermal aging, and water-proofness, and its application is limited.
"On the other hand, a polyester polycarbonate-type elastomer using a polycarbonate as a soft segment has been known as an elastomer excellent in heat resistance, resistance to thermal aging, and water-proofness (see, for example, Patent Documents 2 and 3)."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "Problems to be Solved by the Invention
"However, in the case of using the conventionally known polyester polycarbonate-type elastomer as a sealing material for electrical/electronic part, it is understood that, although excellent in heat resistance, resistance to thermal aging, and water-proofness, the polyester polycarbonate-type elastomer is poor in fluidity due to high viscosity and therefore, it leads to problems that the injection pressure and injection temperature become extremely high at the time of injection molding; that a soldered part is melted or fluidized; that a lead wire of a capacitor or the like is melted or fluidized; and that an electronic part such as a capacitor is damaged by the injection pressure. Further, there is also a problem that a filling defect is easily caused owing to high melt viscosity, and it has been tried to lower the melt viscosity by increasing the injection temperature; however, problems of molding failures such as defective flow to a portion with a thickness of about 1 mm or thinner, a failure of flowing to the end from a gate, and the like still occur easily. Moreover, when an electrical/electronic part sealed with these elastomers is preserved under cold temperature, there occur problems that the elastomers are cracked and the inner parts are damaged and it results in operational failure in an operation test of the electrical/electronic part. From the above-mentioned results, it is made clear that the conventionally known polyester polycarbonate-type elastomer is improper as an electrical/electronic part-sealing material.
"It is an object of the present invention to provide a resin composition for sealing electrical/electronic part having higher melt fluidity than that of the conventionally known polyester polycarbonate-type elastomer and having higher resistance to thermal aging than that of the conventionally known polyester polyether-type elastomer. Further, it is another object of the present invention to provide a polyester composition for electrical/electronic part-sealing material having melt fluidity, initial peel strength, and initial dielectric breakdown strength that are required for electrical/electronic part-sealing material while also having excellent heat resistance, resistance to thermal aging, and durability with respect to hot-cold cycling.
"Solutions to the Problems
"To achieve the above-mentioned objects, the present inventors have made various investigations and proposed the following invention.
"That is, the present invention relates the following resin composition, the following sealed product of electrical/electronic part, which is sealed with the resin composition, and the following method for producing a sealed product of electrical/electronic part.
"(1) A polyester resin composition for electrical/electronic part-sealing material, comprising, as a main component, a copolymer polyester elastomer containing 50 weight % or more and 70 weight % or lower of an aliphatic polycarbonate segment and having 6 equivalents/10.sup.6 g or more and 50 equivalents/10.sup.6 g or lower of terminal vinyl groups.
"(2) The polyester resin composition for electrical/electronic part-sealing material according to (1), wherein the copolymer polyester elastomer is crystalline.
"(3) The polyester resin composition for electrical/electronic part-sealing material according to (1) or (2), wherein a hard segment constituting the copolymer polyester elastomer contains an aromatic dicarboxylic acid with 8 to 14 carbon atoms in an amount of 50 mol % or more as acid components and an aliphatic glycol and/or alicyclic glycol with 2 to 10 carbon atoms in an amount of 50 mol % or more as glycol components.
"(4) The polyester resin composition for electrical/electronic part-sealing material according to any one of (1) to (3), wherein a polycarbonate diol to be used for forming the aliphatic polycarbonate segment is an aliphatic polycarbonate diol residue with a reduced viscosity of 0.5 dl/g or more and 1.3 dl/g or lower.
"(5) A sealed product of electrical/electronic part, which is sealed with the resin composition for electrical/electronic part-sealing material according to any one of (1) to (4).
"(6) A method for producing a sealed product of electrical/electronic part comprising steps of: installing at least one of an electric cable, a circuit, and a terminal in a the and injecting the resin composition for electrical/electronic part-sealing material according to any one of (1) to (4) into the die after imparting fluidability to the resin composition under heating.
"Effect of the Invention
"The polyester resin composition of the present invention has melt fluidity suitable for sealing electrical/electronic part and is useful for sealing electrical/electronic part without damaging the electrical/electronic part by setting proper temperature and pressure owing to use of a copolymer polyester elastomer with the specified composition as a main component. The polyester resin composition of the present invention and a sealed product of electrical/electronic part obtained by using the composition are excellent in initial adhesion represented by initial peel strength to an object to be sealed and also excellent in initial electric insulation represented by initial dielectric breakdown strength owing to use of a copolymer polyester elastomer with the specified composition as a main component. The polyester resin composition of the present invention and a sealed product of electrical/electronic part obtained by using the composition are excellent in resistance to thermal aging, and show excellent resistance to thermal aging with a small decrease in tensile elongation, peel strength, and dielectric breakdown strength even after a heat load at, for example, 150.degree. C. for 1000 hours owing to use of a copolymer polyester elastomer with the specified composition as a main component. The polyester resin composition of the present invention and a sealed product of electrical/electronic part obtained by using the composition are also excellent in durability with respect to hot-cold cycling, and not only the sealed product is hardly cracked but also the electrical/electronic part to be sealed is hardly damaged. Further, they show excellent durability with respect to hot-cold cycling with a small decrease in peel strength even after hot-cold cycling between, for example, -40.degree. C. and 150.degree. C."
For the URL and additional information on this patent, see: Sakai, Junko; Shiga, Kenji. Polyester Resin Composition for Electrical/Electronic Part-Sealing Material, Sealed Product, and Production Method. U.S. Patent Number 9080091, filed February 21, 2012, and published online on July 14, 2015. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9080091.PN.&OS=PN/9080091RS=PN/9080091
(4 Traders)
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1.The news above mentioned with detailed source are from internet.We are trying our best to assure they are accurate ,timely and safe so as to let bearing users and sellers read more related info.However, it doesn't mean we agree with any point of view referred in above contents and we are not responsible for the authenticity. If you want to publish the news,please note the source and you will be legally responsible for the news published.
2.All news edited and translated by us are specially noted the source"CBCC".
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