JP5318780B2 - マルチフィラメント、モノフィラメント、不織布又はテープ。 - Google Patents

マルチフィラメント、モノフィラメント、不織布又はテープ。 Download PDF

Info

Publication number
JP5318780B2
JP5318780B2 JP2009543438A JP2009543438A JP5318780B2 JP 5318780 B2 JP5318780 B2 JP 5318780B2 JP 2009543438 A JP2009543438 A JP 2009543438A JP 2009543438 A JP2009543438 A JP 2009543438A JP 5318780 B2 JP5318780 B2 JP 5318780B2
Authority
JP
Japan
Prior art keywords
group
tert
butyl
bis
hydroxy
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2009543438A
Other languages
English (en)
Japanese (ja)
Other versions
JP2010514948A (ja
JP2010514948A5 (enExample
Inventor
ミュラー，ダニエル
ポークェット，ジーン−ロッシ
ジャッジ，アンソニー
マイヤー，ハンスペター
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Schweiz AG
Original Assignee
Ciba Holding AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ciba Holding AG filed Critical Ciba Holding AG
Publication of JP2010514948A publication Critical patent/JP2010514948A/ja
Publication of JP2010514948A5 publication Critical patent/JP2010514948A5/ja
Application granted granted Critical
Publication of JP5318780B2 publication Critical patent/JP5318780B2/ja
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/10—Other agents for modifying properties
    • D01F1/106—Radiation shielding agents, e.g. absorbing, reflecting agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/06—Copolymers with styrene
    • C08L9/08—Latex
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F1/00—General methods for the manufacture of artificial filaments or the like
    • D01F1/02—Addition of substances to the spinning solution or to the melt
    • D01F1/04—Pigments
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
    • D01F6/06—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins from polypropylene
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/28—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D01F6/30—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from copolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds comprising olefins as the major constituent
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
    • D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
    • D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4282—Addition polymers
    • D04H1/4291—Olefin series
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2321/00—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D10B2321/02—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins
    • D10B2321/021—Fibres made from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds polyolefins polyethylene
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/22—Physical properties protective against sunlight or UV radiation
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/20—Industrial for civil engineering, e.g. geotextiles
    • D10B2505/202—Artificial grass

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Textile Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Polymers & Plastics (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Artificial Filaments (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
JP2009543438A 2006-12-27 2007-12-17 マルチフィラメント、モノフィラメント、不織布又はテープ。 Active JP5318780B2 (ja)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06127222.5 2006-12-27
EP06127222 2006-12-27
PCT/EP2007/064023 WO2008077830A2 (en) 2006-12-27 2007-12-17 Multifilament, monofilament, non-woven or tape

Publications (3)

Publication Number Publication Date
JP2010514948A JP2010514948A (ja) 2010-05-06
JP2010514948A5 JP2010514948A5 (enExample) 2011-02-10
JP5318780B2 true JP5318780B2 (ja) 2013-10-16

Family

ID=38229033

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009543438A Active JP5318780B2 (ja) 2006-12-27 2007-12-17 マルチフィラメント、モノフィラメント、不織布又はテープ。

Country Status (13)

Country Link
US (3) US20100040809A1 (enExample)
EP (1) EP2094887B1 (enExample)
JP (1) JP5318780B2 (enExample)
KR (1) KR101433138B1 (enExample)
CN (1) CN101600822B (enExample)
AR (1) AR064559A1 (enExample)
AU (1) AU2007338135B2 (enExample)
ES (1) ES2595553T3 (enExample)
MX (1) MX339304B (enExample)
PL (1) PL2094887T3 (enExample)
SA (1) SA07280749B1 (enExample)
TW (1) TWI445857B (enExample)
WO (1) WO2008077830A2 (enExample)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008077830A2 (en) * 2006-12-27 2008-07-03 Ciba Holding Inc. Multifilament, monofilament, non-woven or tape
JP5224497B2 (ja) * 2007-02-22 2013-07-03 株式会社Ａｄｅｋａ 樹脂組成物
EP2039830A1 (en) * 2007-09-22 2009-03-25 Bonar Yarns & Fabrics, Ltd. Cool artifical turf
JP5283153B2 (ja) * 2007-10-25 2013-09-04 株式会社Ａｄｅｋａ 合成樹脂組成物及び自動車内外装材
JP5361217B2 (ja) 2008-02-29 2013-12-04 株式会社Ａｄｅｋａ 耐候性の改善された木質系合成樹脂組成物およびその成形体
TWI473851B (zh) * 2008-07-22 2015-02-21 Basell Polyolefine Gmbh 在包含生質柴油及氧之液態燃料存在下具改良抗熱氧化降解力之乙烯聚合物及由其所製成之塑料燃料槽
US9855682B2 (en) 2011-06-10 2018-01-02 Columbia Insurance Company Methods of recycling synthetic turf, methods of using reclaimed synthetic turf, and products comprising same
CN103526374B (zh) * 2013-10-26 2016-03-02 上海婉静纺织科技有限公司 远红外莫代尔纤维家纺面料
EP2940212A1 (en) * 2014-05-02 2015-11-04 Polytex Sportbeläge Produktions-GmbH Artificial Turf production using a nucleating agent
JP2018500468A (ja) * 2014-10-31 2018-01-11 クロックス テクノロジーズ インコーポレイテッドＫｌｏｘ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｉｎｃ． 光活性性の繊維および織物媒体
EP3235930A1 (en) * 2016-04-18 2017-10-25 Polytex Sportbeläge Produktions-GmbH Artificial turf fiber with lldpe and ldpe
CA3201706A1 (en) 2020-12-09 2022-06-16 Gregor Huber Additive mixtures

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3740303A (en) * 1971-01-11 1973-06-19 Du Pont Artificial playing surface
US4863981A (en) * 1986-06-30 1989-09-05 Ciba-Geigy Corporation Synergistic mixture of stabilizers
TW358820B (en) * 1995-04-11 1999-05-21 Ciba Sc Holding Ag Synergistic stabilizer mixture
US5795941A (en) * 1995-10-03 1998-08-18 The Dow Chemical Company Crosslinkable bimodal polyolefin compositions
CN1224732A (zh) * 1997-12-05 1999-08-04 西巴特殊化学品控股有限公司 聚酰胺、聚酯和聚缩醛的稳定处理
US6271377B1 (en) * 1999-02-25 2001-08-07 Ciba Specialty Chemicals Corporation Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
EP1077227B1 (en) * 1999-08-17 2006-06-07 Ciba SC Holding AG Stabilizer mixtures
US6828364B2 (en) * 2000-07-14 2004-12-07 Ciba Specialty Chemicals Corporation Stabilizer mixtures
ITMI20012085A1 (it) * 2000-10-17 2003-04-09 Ciba Sc Holding Ag Polpropilene metallocene stabilizzato
US20030225191A1 (en) * 2002-04-12 2003-12-04 Francois Gugumus Stabilizer mixtures
EP1338622A3 (en) * 2003-03-14 2003-09-10 Ciba SC Holding AG Stabilizer mixtures
WO2008077830A2 (en) * 2006-12-27 2008-07-03 Ciba Holding Inc. Multifilament, monofilament, non-woven or tape

Also Published As

Publication number Publication date
EP2094887B1 (en) 2016-07-06
PL2094887T3 (pl) 2016-12-30
MX2009006842A (es) 2009-07-07
AR064559A1 (es) 2009-04-08
WO2008077830A3 (en) 2008-08-28
CN101600822B (zh) 2016-05-25
TWI445857B (zh) 2014-07-21
AU2007338135B2 (en) 2012-10-25
MX339304B (es) 2016-05-19
US20140243459A1 (en) 2014-08-28
JP2010514948A (ja) 2010-05-06
TW200900544A (en) 2009-01-01
ES2595553T3 (es) 2016-12-30
CN101600822A (zh) 2009-12-09
KR101433138B1 (ko) 2014-09-25
US9574288B2 (en) 2017-02-21
KR20090093983A (ko) 2009-09-02
US10309039B2 (en) 2019-06-04
EP2094887A2 (en) 2009-09-02
US20170096749A1 (en) 2017-04-06
US20100040809A1 (en) 2010-02-18
AU2007338135A1 (en) 2008-07-03
SA07280749B1 (ar) 2011-01-24
WO2008077830A2 (en) 2008-07-03

Similar Documents

Publication Publication Date Title
JP5318780B2 (ja) マルチフィラメント、モノフィラメント、不織布又はテープ。
EP1367091B1 (en) Agricultural articles
US7820744B2 (en) Stabilizer mixtures
JP5669584B2 (ja) フラットパネルディスプレイ用光学フィルム
BRPI0707355A2 (pt) uso de aminas secundárias estericamente impedidas como aditivos de processamento em processos de rotomoldagem
US6545071B1 (en) Stabilizer mixtures
US6566427B1 (en) Stabilizer mixtures
US7628936B2 (en) Stabilizer mixtures
EP3328928B1 (en) An additive mixture
KR20210099613A (ko) 폴리에틸렌 또는 폴리프로필렌 물품
AU2019204621B2 (en) Light stabilized polyolefin films, tapes and monofilaments
US6328912B1 (en) Tetramethylpiperidyl-containing polysiloxane or polyamine/cyanuric cl/tetramethyl-4-piperidylamine stabilizer

Legal Events

Date Code Title Description
A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101216

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20101216

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120531

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120606

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20120830

A602 Written permission of extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A602

Effective date: 20120906

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20121205

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20121205

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130626

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130710

R150 Certificate of patent or registration of utility model

Ref document number: 5318780

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250