Polycarbonate resin composition, method for producing same and molded article of this resin composition

Patent metadata

Field	Value
Publication number	US-2016237276-A1
Application number	US-201615141411-A
Country	US
Kind code	A1
Filing date	Apr 28, 2016
Priority date	Mar 31, 2010
Publication date	Aug 18, 2016
Grant date	—

Abstract

To provide a polycarbonate resin composition excellent in the surface hardness, the heat resistance, the moldability and the flame retardancy.
A polycarbonate resin composition comprising at least a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a), which satisfies the following requirements:
(i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184; (ii) the glass transition point Tg(a) of the polycarbonate resin (a) and the glass transition point Tg(b) of the polycarbonate resin (b) satisfy the relation of the following (Formula 1):

Tg ( b )−45° C.< Tg ( a )< Tg ( b )−10° C.  (Formula 1)

and
(iii) the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is higher by at least two ranks than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184.

First claim

1 . (canceled)

2 . A molded article of polycarbonate resin, comprising:
a polycarbonate resin (a) and a polycarbonate resin (b) having structural units different from the polycarbonate resin (a); wherein the polycarbonate resin (a) comprises structural units derived from a compound of formula (1):

wherein
each of R 1 and R 2 which are independent of each other, is a substituted or non-substituted C 1-20 alkyl group or a substituted or non-substituted aryl group, each of R 3 and R 4 which are independent of each other, is a hydrogen atom, a substituted or non-substituted C 1-20 alkyl group or a substituted or non-substituted aryl group, and X is a single bond, a carbonyl group, a substituted or non-substituted alkylidene group, an oxidized or non-oxidized sulfur atom, or an oxygen atom;
wherein
a ratio of the content [S] of the structural units of formula (1) on the surface of the molded article to a content [T] in the entire molded article ([S]/[T]) is higher than 1.00 and at most 2.00, and
wherein
the polycarbonate resin satisfies the following requirements:
(i) the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is higher than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184;
(ii) the glass transition point Tg(a) of the polycarbonate resin (a) and the glass transition point Tg(b) of the polycarbonate resin (b) satisfy the relation of the following Formula:
Tg ( b )−45° C.<( a )< Tg ( b )−10° C.

and (iii) the pencil hardness of the polycarbonate resin composition as specified by ISO 15184 is higher by at least two ranks than the pencil hardness of the polycarbonate resin (b) as specified by ISO 15184.

3 . The molded article of claim 2 , wherein the article is injection-molded.

4 . The molded article of claim 2 , wherein the ratio ([S]/[T]) is at least 1.01 and at most 1.50.

5 . The molded article of claim 2 , wherein the pencil hardness on the surface of the molded article of polycarbonate resin as specified by ISO 15184 is at least HB.

6 . The molded article of claim 2 , wherein the structural units (a) are structural units derived from at least one compound selected from the group consisting of formulae (1a) to (1c):

7 . The molded article of claim 2 , wherein the polycarbonate resin (b) comprises structural units (b) derived from a compound of formula (2):

8 . The molded article of claim 2 , wherein the pencil hardness of the polycarbonate resin (a) as specified by ISO 15184 is at least F.

9 . The molded article of claim 2 , wherein a viscosity average molecular weight of the polycarbonate resin (a) is higher than the viscosity average molecular weight of the polycarbonate resin (b).

10 . A method for producing the molded article of claim 2 , comprising: melt-kneading or dry-blending the polycarbonate resin (a) and the polycarbonate resin (b), followed by molding,
wherein the viscosity average molecular weight of the polycarbonate resin (a) is higher than the viscosity average molecular weight of the polycarbonate resin (b).

11 . The method of claim 10 , wherein the structural units (a) are structural units derived from at least one compound selected from the group consisting of formulae (1a) to (1c):

12 . The method of claim 10 , wherein the structural units (b) comprise structural units derived from a compound of formula (2):

13 . The method of claim 9 , wherein the molding is injection-molding.

Assignees

• Hitomi Tatsuya
• Nishihara Ryouhei
• Yamamoto Masanori
• Nakata Michio
• Nobuyasu Tetsurou
• Uchimura Ryuuji
• Takahashi Kazuyuki
• Tsuruhara Kenji
• Yokoyama Tomonari
• Mitsubishi Chem Corp
• Mitsubishi Engineering-Plastics Corp

Inventors

• Hitomi Tatsuya
• Nishihara Ryouhei
• Yamamoto Masanori
• Nakata Michio
• Nobuyasu Tetsurou
• Uchimura Ryuuji
• Takahashi Kazuyuki
• Tsuruhara Kenji
• Yokoyama Tomonari

Classifications

• B29B7/46

  with more than one shaft · CPC title

• B29B9/12

  characterised by structure or composition · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• B29C47/0021

  Operations & Transport · mapped topic

• B29K2105/0067

  Melt · CPC title