Resin composition for sealing electrical electronic parts, method of producing electrical electronic parts, and sealed electrical electronic parts

1. A resin composition for sealing electrical and electronic parts, comprising:

a copolymerized polyester (A) containing a polyalkylene glycol component and/or a polylactone component;

an epoxy resin (B);

a polyolefin resin (C); and

a phosphoric ester (D),

wherein the phosphoric ester (D) comprises an isopropylated triaryl phosphate of formula (4) and a triphenylphosphate of formula (5) in a ratio of 99/1 to 1/99 in % by weight

wherein m is an integer of 1 to 5, and

2. The resin composition for sealing electrical and electronic parts according to claim 1 , wherein the polyester (A) is a copolymer which contains the polyalkylene glycol component and/or the polylactone component in a total amount of 20 to 80% by weight.

3. The resin composition for sealing electrical and electronic parts according to claim 1 , wherein the epoxy resin (B) is a phosphorus-containing epoxy resin (B1), a phosphorus-free epoxy resin (B2), or a mixture thereof.

4. The resin composition for sealing electrical and electronic parts according to claim 3 , wherein the phosphorus-containing epoxy resin (B1) is a mixture of a compound of formula (1) and a compound of formula (2) and/or a compound of formula (3):

wherein n is an integer of 1 to 50,

wherein R1 is hydrogen, a linear or branched alkyl group having 1 to 6 carbon atoms, or a linear or branched hydroxyalkyl group having 1 to 6 carbon atoms and having up to 3 hydroxyl groups at each end, and

wherein R2 to R6 are each independently hydrogen, a hydroxyl group, a linear or branched alkyl group having 1 to 6 carbon atoms, or a linear or branched hydroxyalkyl group having 1 to 6 carbon atoms and having up to 3 hydroxyl groups at each end.

5. The resin composition for sealing electrical and electronic parts according to claim 4 , wherein a ratio of the compound of formula (1) to a total of the compound of formula (2) and/or the compound of formula (3) is 99.9/0.1 to 0.1/99.9 in % by weight.

6. The resin composition for sealing electrical and electronic parts according to claim 1 , which comprises 0.1 to 50 parts by weight of the epoxy resin (B), 0.5 to 80 parts by weight of the polyolefin resin (C), and 0.1 to 20 parts by weight of the phosphoric ester (D), based on 100 parts by weight of the polyester (A).

7. The resin composition for sealing electrical and electronic parts according to claim 1 , further comprising an alkyl benzene resin (E) and/or a phenol resin (F).

8. The resin composition for sealing electronic and electrical parts according to claim 7 , wherein the alkyl benzene resin (E) is an alkylphenol-modified alkyl benzene resin and has a hydroxyl value of 100 equivalents/10 6 g or more.

9. The resin composition for sealing electronic and electrical parts according to claim 7 , wherein the phenol resin (F) is a novolac type phenol resin and has a hydroxyl value of 100 equivalents/10 6 g or more.

10. The resin composition for sealing electronic and electrical parts according to claim 7 , which comprises a total of 0.1 to 45 parts by weight of the alkyl benzene resin (E) and/or the phenol resin (F), based on 100 parts by weight of the polyester (A).

11. The resin composition for sealing electrical and electronic parts according to claim 1 , which has an initial T-type peeling strength to a glass epoxy substrate of 25 N/20 mm or more.

12. A method for producing sealed electrical and electronic parts, comprising:

heating and kneading the resin composition according to claim 1 ; and

thereafter injecting the resin composition into a mold including an inserted electrical and electronic part at a resin composition temperature of 130° C. or more and 260° C. or less and at a resin composition pressure of 0.1 MPa or more and 20 MPa or less.

13. A sealed electrical and electronic part sealed with the resin composition according to claim 1 .