WO2010103988A1 - 医療容器栓体用エラストマー組成物 - Google Patents
医療容器栓体用エラストマー組成物 Download PDFInfo
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- WO2010103988A1 WO2010103988A1 PCT/JP2010/053522 JP2010053522W WO2010103988A1 WO 2010103988 A1 WO2010103988 A1 WO 2010103988A1 JP 2010053522 W JP2010053522 W JP 2010053522W WO 2010103988 A1 WO2010103988 A1 WO 2010103988A1
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- WIPO (PCT)
- Prior art keywords
- block copolymer
- block
- mass
- copolymer
- butadiene
- Prior art date
Links
- 239000000203 mixture Substances 0.000 title claims abstract description 79
- 229920001971 elastomer Polymers 0.000 title claims abstract description 18
- 239000000806 elastomer Substances 0.000 title claims abstract description 12
- 229920001400 block copolymer Polymers 0.000 claims abstract description 122
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims abstract description 57
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229920000642 polymer Polymers 0.000 claims abstract description 45
- 229920001155 polypropylene Polymers 0.000 claims abstract description 26
- 229920001577 copolymer Polymers 0.000 claims abstract description 21
- 238000009826 distribution Methods 0.000 claims abstract description 9
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000470 constituent Substances 0.000 claims description 20
- 239000004793 Polystyrene Substances 0.000 claims description 7
- -1 polypropylene Polymers 0.000 claims description 7
- 229920002223 polystyrene Polymers 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 abstract description 65
- 239000004902 Softening Agent Substances 0.000 abstract description 14
- 238000005452 bending Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 28
- 239000000178 monomer Substances 0.000 description 24
- 230000014759 maintenance of location Effects 0.000 description 22
- RRHGJUQNOFWUDK-UHFFFAOYSA-N Isoprene Chemical group CC(=C)C=C RRHGJUQNOFWUDK-UHFFFAOYSA-N 0.000 description 18
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 17
- 239000002994 raw material Substances 0.000 description 12
- 239000002184 metal Substances 0.000 description 10
- 229920002554 vinyl polymer Polymers 0.000 description 10
- 238000011156 evaluation Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 9
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 8
- 239000005977 Ethylene Substances 0.000 description 8
- 238000005984 hydrogenation reaction Methods 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 6
- 229920000098 polyolefin Polymers 0.000 description 6
- 229920002742 polystyrene-block-poly(ethylene/propylene) -block-polystyrene Polymers 0.000 description 6
- 229920002743 polystyrene-poly(ethylene-ethylene/propylene) block-polystyrene Polymers 0.000 description 6
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229920005992 thermoplastic resin Polymers 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 5
- 230000001954 sterilising effect Effects 0.000 description 5
- 238000004659 sterilization and disinfection Methods 0.000 description 5
- 238000001746 injection moulding Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 4
- 229920002633 Kraton (polymer) Polymers 0.000 description 3
- 230000000740 bleeding effect Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 229920005996 polystyrene-poly(ethylene-butylene)-polystyrene Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 239000005662 Paraffin oil Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 239000003480 eluent Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000001802 infusion Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000058 polyacrylate Polymers 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000011925 1,2-addition Methods 0.000 description 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000010692 aromatic oil Substances 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
- C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61J—CONTAINERS SPECIALLY ADAPTED FOR MEDICAL OR PHARMACEUTICAL PURPOSES; DEVICES OR METHODS SPECIALLY ADAPTED FOR BRINGING PHARMACEUTICAL PRODUCTS INTO PARTICULAR PHYSICAL OR ADMINISTERING FORMS; DEVICES FOR ADMINISTERING FOOD OR MEDICINES ORALLY; BABY COMFORTERS; DEVICES FOR RECEIVING SPITTLE
- A61J1/00—Containers specially adapted for medical or pharmaceutical purposes
- A61J1/14—Details; Accessories therefor
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- 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
Definitions
- the present invention relates to an elastomer composition used for producing a plug provided in a medical container such as an infusion bag.
- the composition of this invention contains a specific block copolymer, a propylene polymer, and a softening agent in a specific ratio.
- the molded article obtained using the composition of the present invention has excellent characteristics as a medical container stopper.
- Patent Documents 1 to 5 Several elastomer compositions similar to the present invention are known (Patent Documents 1 to 5). Moreover, these patent documents also disclose that a molded article obtained by using the composition can be used for a medical container stopper.
- Japanese Patent Laid-Open No. 61-037242 Japanese Patent Application Laid-Open No. 07-228749 Japanese Patent Laid-Open No. 09-173417 JP 2002-143270 A JP 2007-050138 A
- the molded product obtained by using the composition disclosed in the above-mentioned patent document is a performance required for a stopper provided in a medical container, heat resistance (no deformation due to high-pressure steam sterilization), liquid resistance It does not satisfy all of the leakage (no leakage of liquid or bleeding from the attachment / detachment site under various needle attachment / detachment conditions) and needle retention (the loaded needle is difficult to come off), and the usage conditions are It was limited.
- An object of this invention is to provide the composition which gives the molded object which is excellent in the said heat resistance, liquid leakage resistance, and needle
- an elastomer composition for a medical container stopper of the invention according to claim 1, 50 to 95 parts by mass of block copolymer A, 5 to 50 parts by mass of the block copolymer P (however, the total amount of the block copolymer A and the block copolymer P is 100 parts by mass), A composition containing 100 to 300 parts by mass of a softening agent B having a kinematic viscosity at 40 ° C. of 50 to 500 cSt, and 1 to 50 parts by mass of a propylene polymer C having a flexural modulus of 1000 to 3000 MPa.
- the block copolymer A is One polymer block Y1 containing a butadiene monomer unit as a main constituent unit and having a 1,2-bond ratio of 10 to 50% in the butadiene monomer unit, A hydrogenated product of a block copolymer Z1 having a polymer block X1 containing a total of two styrene monomer units as main constituent units at both ends of the polymer block Y1, It is a block copolymer having a weight average molecular weight of 160 to 400,000 and a content of styrene monomer units of 20 to 50% by mass.
- the block copolymer P is One butadiene-styrene controlled distribution copolymer block Y2, A hydrogenated product of a block copolymer Z2 having two polystyrene blocks X2 in total, one at each of both ends of the copolymer block Y2, It is a block copolymer having a weight average molecular weight of 160 to 400,000 and a content of styrene monomer units of 40 to 70% by mass.
- the butadiene-styrene controlled distribution copolymer block Y2 which is a constituent of the block copolymer Z2, Having two or more regions YB2 containing butadiene monomer units as main constituent units; Having at least one region YS2 containing a styrene monomer unit as a main constituent unit; Both ends are butadiene-styrene copolymer blocks in the region YB2.
- the elastomer composition for a medical container plug of the invention described in claim 2 is characterized in that in the composition described in claim 1, the propylene polymer C is polypropylene.
- the elastomer composition for a medical container plug of the invention described in claim 3 is the composition according to claim 1 or 2, wherein the A hardness with a measurement time of 1 second measured according to JIS K6253 is 30-50. It is characterized by being.
- the composition of the present invention can be molded by a known method such as injection molding, extrusion molding or press molding.
- the molded product obtained by using the composition of the present invention has excellent heat resistance, liquid leakage resistance, and needle retention, which are important characteristics required for a medical container stopper.
- the numerical range is represented by “lower limit numerical value to upper limit numerical value”, it means that the numerical value is greater than or equal to the lower limit numerical value and less than or equal to the upper limit numerical value.
- the molecular weight is in terms of polystyrene measured by a gel permeation chromatograph (hereinafter also referred to as GPC).
- GPC gel permeation chromatograph
- Mw weight average molecular weight
- Mn number average molecular weight
- Block copolymer A is an important component for improving the heat resistance, liquid leakage resistance and needle retention of the molded product obtained from the composition.
- Block copolymer A is a hydrogenated product of block copolymer Z1, a block copolymer having a weight average molecular weight of 160 to 400,000 and a content of styrene monomer units of 20 to 50% by mass. It is.
- the block copolymer Z1 has one polymer block Y1 containing a butadiene monomer unit as a main constituent unit and having a 1,2-bond ratio of 10 to 50% in the butadiene monomer unit, It is a block copolymer having a polymer block X1 containing a total of two styrene monomer units as main constituent units at both ends of the polymer block Y1.
- the polymer block X1 is a polymer block containing a styrene monomer unit as a main structural unit.
- the polymer block X1 may contain vinyl monomer units other than the styrene monomer unit as long as the composition of the present invention does not impair the performance.
- the proportion of styrene monomer units is preferably 80% by mass or more, more preferably 90% by mass or more, and further preferably 95% by mass or more. If the ratio of the styrene monomer unit is insufficient, the resulting molded product has poor heat resistance.
- the polymer block Y1 contains a butadiene monomer unit as a main structural unit.
- the main structural unit is isoprene or a combination of isoprene and butadiene, the resulting molded article has poor liquid leakage resistance.
- the main structural unit is isobutylene, the obtained molded product has poor heat resistance.
- the polymer block Y1 may contain vinyl monomer units other than butadiene monomer units as long as the composition of the present invention does not impair the performance.
- the proportion of the butadiene monomer unit is preferably 70% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more.
- the polymer block Y1 has a 1,2-bond ratio in the butadiene monomer unit of 10 to 50%, preferably 15 to 45%, more preferably 20 to 40%. If the proportion of 1,2-bonds is too large, the resulting molded product tends to have insufficient rubber elasticity and poor liquid leakage resistance. If the proportion of 1,2-bonds is too small, the resulting molded product has poor compatibility with the propylene polymer C, and the liquid leakage resistance is poor.
- the block copolymer Z1 has two polymer blocks X1 and one polymer block Y1, and each of the polymer blocks Y1 has two polymer blocks X1. Is provided.
- the two polymer blocks X1 may be the same or different.
- the block copolymer having only one polymer block X1 has insufficient heat resistance of the obtained molded body.
- the block copolymer Z1 preferably has 10 to 60% by mass, more preferably 20 to 50% by mass of the polymer block X1 as a constituent polymer block. If the proportion of the polymer block X1 is too small, the resulting molded product may have insufficient heat resistance. If the proportion of the polymer block X1 is too large, the rubber elasticity of the composition will be insufficient. In some cases, the resulting molded article has poor liquid leakage resistance.
- the block copolymer A is obtained by converting the unsaturated bond (derived from butadiene) of the polymer block Y1 into a saturated bond by hydrogenating the block copolymer Z1 by a known method.
- the proportion of hydrogenation is preferably 80% or more, and more preferably 90% or more. If the hydrogenation is not performed or is insufficient, the resulting composition may have insufficient heat resistance.
- Hydrogenation to the block copolymer Z1 is performed under the condition that hydrogenation to the styrene monomer unit does not substantially occur.
- the block copolymer A is often often referred to as an abbreviation SEBS.
- SEBS S means a polymer block X1 containing a styrene monomer unit as a main constituent unit
- EB hydrogenates a polymer block Y1 containing a butadiene monomer unit as a main constituent unit.
- block copolymers similar to the above-mentioned block copolymer A there are block copolymers called abbreviations such as SEPS and SEEPS, but these block copolymers are inappropriate as the block copolymer A of the present invention.
- the main structural unit of the polymer block Y1 in the block copolymer A is butadiene, whereas the main structural unit of the corresponding block in SEPS is isoprene, and the main structural unit of the corresponding block in SEEPS is isoprene. And butadiene.
- a block sandwiched between two S blocks is an EB block
- SEPS is a block sandwiched between two S blocks.
- the block is an EP block
- the block sandwiched between two S blocks is an EEP block (since butadiene in SEEPS is mainly composed of 1,4-bonds, it essentially comprises only ethylene units, butylene.
- E. means the ethylene unit derived from butadiene
- EP means the ethylene unit and propylene unit derived from isoprene.
- the block sandwiched between the two S blocks is an EB block, which is an extremely important action in order to improve the liquid leakage resistance of the molded product obtained using the composition.
- a block sandwiched between two S blocks containing a styrene monomer unit as a main structural unit is a structural unit derived from a 1,2-bonded butadiene monomer unit “—CH 2 —CH (C 2 H 5 ) — ”and a structural unit“ —CH 2 —CH 2 —CH 2 —CH 2 — ”derived from a 1,4-bonded butadiene monomer unit as a main structural unit. is important.
- the block copolymer A has 20 to 50% by mass of styrene monomer units based on the total monomer units. If the proportion of the styrene monomer unit is too small, the resulting molded product has insufficient heat resistance. If the heat resistance is insufficient, the molded product may be deformed during heat treatment such as sterilization. When the proportion of the styrene monomer unit is too large, the rubber elasticity of the composition is insufficient, and the resulting molded product has poor liquid leakage resistance.
- the Mw of the block copolymer A is from 160 to 400,000, preferably from 200 to 350,000. If Mw is too small, the resulting molded product will have insufficient heat resistance. Since the molded product obtained when Mw is too large has insufficient liquid leakage resistance (a mixed injection assumption test using a metal needle described later), its use is limited. Two or more types of the block copolymer A may be used in combination.
- the block copolymer P is an important component for improving the liquid leakage resistance and needle retention of a molded product obtained from the composition.
- the block copolymer P is obtained by hydrogenating the following block copolymer Z2, has a weight average molecular weight of 160 to 400,000, and a styrene monomer unit content of 40 to 70% by mass. It is a certain block copolymer.
- the block copolymer Z2 is a block copolymer having one butadiene-styrene controlled distribution copolymer block Y2 and two polystyrene blocks X2 in total, one at each end of the copolymer block Y2. .
- the said controlled distribution copolymer block means the copolymer block which has the area
- the polystyrene block X2 bonded to both ends of the copolymer block Y2 is a polymer block substantially composed of styrene monomer units.
- the polystyrene block X2 preferably has a styrene monomer unit ratio of 90% by mass or more, more preferably 95% by mass or more, of all monomer units constituting the block.
- the butadiene-styrene controlled distribution copolymer block Y2 which is a component of the block copolymer Z2, Having two or more regions YB2 containing butadiene monomer units as main constituent units; Having at least one region YS2 containing a styrene monomer unit as a main constituent unit; Both ends are butadiene-styrene copolymer blocks in the region YB2.
- the region YB2 contains a butadiene monomer unit as a main structural unit.
- the main structural unit is isoprene or a combination of isoprene and butadiene
- the resulting molded article has poor liquid leakage resistance.
- the main structural unit is isobutylene
- the obtained molded product has poor heat resistance.
- the region YB2 may contain a vinyl monomer unit other than the butadiene monomer unit as long as the composition of the present invention does not impair the performance.
- the proportion of the butadiene monomer unit needs to exceed 50% by mass, preferably 60% by mass or more, more preferably 70% by mass or more, and 80% by mass or more. Is more preferable.
- the vinyl monomer unit other than the butadiene monomer unit is preferably substantially a styrene monomer unit.
- the region YS2 contains a styrene monomer unit as a main structural unit.
- the region YS2 may contain a vinyl monomer unit other than the styrene monomer unit as long as the composition of the present invention does not impair the performance.
- the proportion of the styrene monomer unit needs to exceed 50% by mass, preferably 60% by mass or more, more preferably 70% by mass or more, and 80% by mass or more. Is more preferable. If the ratio of the styrene monomer unit is insufficient, the resulting molded product has poor heat resistance.
- the vinyl monomer unit other than the styrene monomer unit is preferably a butadiene monomer unit.
- the region YB2 may be a region that can be regarded as a block.
- the region YS2 may be a region that can be regarded as a block.
- the butadiene-styrene controlled distribution copolymer block Y2 can treat itself as a block copolymer. .
- the block copolymer P is obtained by hydrogenating the block copolymer Z2 by a known method to convert unsaturated bonds derived from butadiene of the copolymer block Y2 into saturated bonds.
- the proportion of hydrogenation is preferably 80% or more, and more preferably 90% or more. If the hydrogenation is not performed or is insufficient, the resulting composition may have insufficient heat resistance.
- Hydrogenation to the block copolymer Z2 is performed under the condition that hydrogenation to the styrene monomer unit does not substantially occur.
- the block copolymer P is represented by “S-EB-S-EB-S” as an example of the model structure. Including polymers.
- block copolymer P is also included in the concept of SEBS, in the present specification, for the purpose of identification, the block copolymer A is simply referred to as SEBS, and the block copolymer P is referred to as a multi-block SEBS for convenience. That's it.
- the block copolymer P has 40 to 70% by mass of styrene monomer units based on the total monomer units. If the proportion of the styrene monomer unit is too small, the resulting molded product has insufficient needle retention and is also insufficient in heat resistance. When the proportion of the styrene monomer unit is too large, the rubber elasticity of the composition is insufficient, and the resulting molded product has poor liquid leakage resistance.
- the Mw of the block copolymer P is 160 to 400,000, and preferably 200 to 350,000. If Mw is too small, the resulting molded product will have insufficient heat resistance. If the heat resistance is insufficient, the molded product may be deformed during heat treatment such as sterilization. Since the molded product obtained when Mw is too large has insufficient liquid leakage resistance (a mixed injection assumption test using a metal needle described later), its use is limited. Two or more types of the block copolymer P may be used in combination.
- the block copolymer A and the block copolymer P are used in a range of 50 to 95 parts by mass and 5 to 50 parts by mass, respectively, so that the total of both is 100 parts by mass. Is done.
- the proportion of the block copolymer A is too small (the proportion of the block copolymer P is too large), the resulting molded product has insufficient liquid leakage resistance. If the proportion of the block copolymer A is too large (the proportion of the block copolymer P is too small), the resulting molded article will have insufficient needle retention.
- the softening agent B is a component that improves the balance between the liquid leakage resistance and the needle retention of the resulting molded article, and also provides fluidity to the heat-melted composition to improve the moldability. It is an ingredient.
- the softening agent B an oily compound usually added to a thermoplastic elastomer composition can be used.
- the softening agent B include mineral oils such as paraffin oil, naphthene oil, and aromatic oil, as well as low-polymerization vinyl polymers that are liquid at room temperature (20 ° C.) (olefin polymers, diene compound polymers, Acrylic polymer etc. can also be used. Paraffin oil is preferred as the softener B.
- the softening agent B has a kinematic viscosity at 40 ° C. in the range of 50 to 500 cSt, preferably 55 to 300 cSt. If the kinematic viscosity is too small, the resulting molded product has insufficient liquid leakage resistance, and the softener tends to bleed on the surface of the molded product. If the kinematic viscosity is too large, the composition tends to have insufficient moldability, and the resulting molded product has insufficient liquid leakage resistance. Two or more kinds of the softening agents B may be used in combination.
- the propylene polymer C is a component that improves the balance between the liquid leakage resistance and the needle retention of the obtained molded product, and is a component that improves the moldability of the composition.
- the propylene polymer C is a polymer containing a propylene monomer unit as a main constituent unit, and may be a propylene homopolymer or a proportion other than propylene in a range not impairing the performance of the molded product. It may be a copolymer obtained by copolymerizing a radical polymerizable monomer. In the case of a copolymer, the proportion of the propylene monomer unit is preferably 70% by mass or more, more preferably 80% by mass or more, and further preferably 90% by mass or more.
- the resulting molded product has poor liquid leakage resistance and needle retention.
- Two or more kinds of the propylene polymer C may be used in combination.
- the propylene polymer C has a flexural modulus in the range of 1000 to 3000 MPa, preferably 1100 to 2500 MPa, and more preferably 1200 to 2000 MPa. If the flexural modulus is too small, the resulting molded product has poor liquid leakage resistance and needle retention. If the flexural modulus is too large, the resulting molded product has poor liquid leakage resistance.
- the composition of the present invention comprises 50 to 95 parts by mass of the block polymer A, 5 to 50 parts by mass of the block polymer P (a total amount of 100 parts by mass of the block polymer A and the block polymer P), and the softening 100 to 300 parts by weight of agent B (preferably 120 to 280 parts by weight, more preferably 140 to 250 parts by weight, still more preferably 150 to 230 parts by weight), and 1 to 50 parts by weight of propylene polymer C (preferably 5 to 40 parts by weight, more preferably 10 to 30 parts by weight).
- the proportion of the softening agent B is too small, the composition has insufficient moldability, and the resulting molded article has insufficient liquid leakage resistance.
- the ratio of the softening agent B is too large, the molded product has poor needle retention and liquid leakage resistance tends to be insufficient.
- the amount of the propylene polymer C is too small, the composition has insufficient moldability, and if it is too large, the resulting molded product has insufficient liquid leakage resistance.
- the composition of the present invention may contain other optional components as long as the performance is not impaired.
- a thermoplastic resin other than the block copolymer A, the block copolymer P and the propylene polymer C hereinafter referred to as other thermoplastic resin
- a filler for suppressing deterioration, decomposition, etc.
- additives for suppressing deterioration, decomposition, etc. of main components represented by antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers and the like are examples of main components represented by antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers and the like.
- the blending ratio when the optional component is blended is appropriately determined within a range not impairing the performance of the composition and the molded body.
- thermoplastic resins include block copolymers other than the block copolymer A and the block copolymer P, propylene polymers other than the propylene polymer C, polyethylene, ethylene-vinyl acetate copolymer, ethylene - ⁇ -olefin copolymer, acrylic polymer, polyurethane, polyester, polyether and the like.
- the blending ratio is preferably 100 parts by weight or less, and preferably 70 parts by weight or less, based on the total amount of 100 parts by weight of the block copolymer A and the block copolymer P. More preferably, it is more preferably 40 parts by mass or less, particularly preferably 20 parts by mass or less, and most preferably 15 parts by mass or less. If the proportion of other thermoplastic resins is too large, the resulting molded product may have insufficient heat resistance, liquid leakage resistance, and needle retention.
- the composition of the present invention can be obtained by mixing and / or kneading a predetermined proportion of the above components by a known means.
- a Henschel mixer, a ribbon blender, a V-type blender, or the like can be used.
- kneading an extruder, a mixing roll, a kneader, a Banbury mixer, a Brabender plastograph, or the like can be used.
- powder or pellet solid main raw materials are stirred and mixed (dry blended) with a mixer, and then the liquid main raw material (component B) is added and stirred and mixed (components) A, P, and C are impregnated with component B), and if necessary, other raw materials are added, and stirred and mixed to obtain a blended powder.
- the method of kneading the resulting blended powder with an extruder and pelletizing it is a preferred method for preparing the composition.
- a method of adding “other raw materials” together with the solid main raw materials (components A, P, C) from the beginning may be employed.
- the composition of the present invention can be molded using a known molding machine such as an injection molding machine, an extrusion molding machine, or a press molding machine.
- a molded product obtained by molding the composition of the present invention is excellent in heat resistance, liquid leakage resistance and needle retention, which are important characteristics required for a plug for a medical container. Therefore, the molded product obtained by molding the composition of the present invention can be suitably used as a plug for medical containers.
- the composition of the present invention preferably has an A hardness of 1 to 50 seconds measured according to JIS K6253, more preferably 30 to 45, and more preferably 30 to 40. Further preferred. If the A hardness is too small, the resulting molded product has insufficient needle retention. If the A hardness is too large, the resulting molded product has insufficient liquid leakage resistance. Details of the A hardness measurement conditions in this specification will be described later.
- Block copolymer A and comparative block copolymer A ′ -Block copolymer A1 G1651 (Clayton hydrogenated block copolymer SEBS, styrene monomer unit content ratio: 33% by mass, Mw: 290,000, Mn: 260,000, 1,2 in butadiene monomer units -Ratio of binding: 37%)
- Block copolymer A2 Septon 8006 (hydrogenated block copolymer SEBS manufactured by Kuraray Co., Ltd., styrene monomer unit content ratio: 33% by mass, Mw: 280,000, Mn: 260,000, in butadiene monomer unit 1,2-bond ratio: 36%)
- Comparative block copolymer A′1 G1650 (Clayton hydrogenated block copolymer SEBS, styrene monomer unit content ratio: 29% by mass, Mw: 110,000, Mn: 100,000, butadiene monomer unit (The ratio of 1,
- Block copolymer P and comparative block copolymer P ′ -Block copolymer P1 RP6935 (Clayton hydrogenated block copolymer multiblock SEBS, styrene monomer unit content ratio: 58%, Mw: 270,000, Mn: 250,000)
- Block copolymer for comparison P′1 RP6936 (Clayton hydrogenated block copolymer multiblock SEBS, styrene monomer unit content ratio: 39%, Mw: 150,000, Mn: 140,000)
- the measurement conditions of molecular weight by GPC are as follows. ⁇ Pump: PU-980 manufactured by JASCO (JASCO Corporation) Column oven: Showa Denko Co., Ltd. AO-50 ⁇ Detector: Hitachi RI (differential refractometer) detector L-3300 Column type: Showa Denko Co., Ltd. “K-805L (8.0 ⁇ 300 mm)” and “K-804L (8.0 ⁇ 300 mm)” used in series. Column temperature: 40 ° C.
- Softener B and comparative softener B ' Softener B1 Caydol (Sonneborn oil, kinematic viscosity at 40 ° C .: 64-70 cSt)
- Softener B′1 Markol N172 (Exxon Mobil oil, kinematic viscosity at 40 ° C .: 33 cSt)
- Propylene polymer C and comparative olefin polymer C ′ Propylene polymer C1: PM600A (Sun Allomer Co., Ltd. polypropylene, flexural modulus: 1600 MPa, MFR (melt flow rate): 7.5 g / 10 min) -Comparative olefin polymer C'1: PH943B (Propylene polymer manufactured by Sun Allomer Co., Ltd., flexural modulus: 550 MPa, MFR (melt flow rate): 21 g / 10 min) Olefin polymer for comparison C'2: J5900 (Prime Polymer Polypropylene Co., Ltd., flexural modulus: 420 MPa, MFR (melt flow rate): 8 g / 10 min) -Olefin polymer for comparison C'3: Nipolon Hard 1000 (Tosoh HDPE (high density polyethylene), flexural modulus: 1160 MPa, MFR (melt flow rate): 20
- thermoplastic resin / other block copolymer D1 G1641 (high vinyl hydrogenated block copolymer SEBS made by Kraton, styrene monomer unit content ratio: 32%, Mw: 240,000, Mn: 220,000, 1,2-bond ratio in butadiene monomer unit: 67%) (Although it is the same polymer as the comparative block copolymer A′5, it is referred to as D1 for convenience when blended as an optional component.)
- a hardness About what formed the 2 mm-thick molded object 3 sheets (total 6mm), A hardness (value after 1 second from a test start) for the measurement time 1 second based on JISK6253 was measured. The measurement was carried out after conditioning for one day in a room at a temperature of 23 ° C. and a humidity of 50%. The preferred A hardness is 30-50.
- Liquid leakage resistance 2 (mixed injection assumption test)) Set a plug (columnar shaped body) on a liquid storage tank and a liquid leak tester equipped with a plug mounting part at the bottom of the liquid storage tank, pour 500 ml of water into the liquid storage tank, and a water pressure of 0.01 MPa is applied to the flat surface of the plug. I did it. The evaluation was performed indoors at a temperature of 23 ° C. and a humidity of 50%. A medical metal needle (18G manufactured by Terumo Corporation) attached to the syringe is inserted into the center of the plug body from below the plug body perpendicularly to the plane of the plug body, and the syringe and the metal needle are inclined about 30 degrees for 15 seconds.
- a medical metal needle (18G manufactured by Terumo Corporation) attached to the syringe is inserted into the center of the plug body from below the plug body perpendicularly to the plane of the plug body, and the syringe and the metal needle are inclined about 30 degrees for
- the metal needle was removed from the plug while being tilted. The same operation as described above for inserting the metal needle into the plug and removing it from the plug was repeated once more.
- the second injection was performed using the same syringe and metal needle as the first, and the second insertion was performed at the same location as the first insertion.
- the liquid leakage (water leakage) state from the needle hole generated in the stopper was visually evaluated after 1 hour. Evaluation was performed on 20 plugs. ⁇ : Neither bleeding nor liquid leakage was observed. ⁇ : Smudge was observed, but no liquid leakage was observed. X: Liquid leakage was observed.
- the plug body was set on the test stand so that the plane of the plug body (cylindrical shaped body) was parallel to the horizontal plane. The evaluation was performed indoors at a temperature of 23 ° C. and a humidity of 50%. Insert a medical metal needle (TC-00501K, manufactured by Terumo Corporation) with a weight of 500g from the bottom of the plug body into the center of the plug body, perpendicular to the plane of the plug body, and then fall off after inserting the metal needle. Time (needle holding time, unit is second). The needle holding time is preferably 100 seconds or more, and more preferably 120 seconds or more.
- Comparative Example 1 relates to a composition not containing the block copolymer P, and the needle retention was extremely poor.
- Comparative Example 2 relates to a composition in which the use ratio of the softening agent B is too small, and the liquid leakage resistance was extremely poor.
- Comparative Example 3 relates to a composition in which the use ratio of the softening agent B is too large, and the needle retention was extremely poor and the liquid leakage resistance was also poor.
- Comparative Example 4 relates to a composition in which the proportion of the propylene polymer C used is too large, and the liquid leakage resistance was extremely poor.
- Comparative Example 5 relates to a composition in which a comparative block copolymer A ′ having a small Mw is blended in place of the block copolymer A, and has poor heat resistance.
- Comparative Example 6 relates to a composition containing a comparative block copolymer A ′ having a large Mw instead of the block copolymer A, and has needle retention and liquid leakage resistance 2 (mixed injection assumption test). It was bad.
- Comparative Examples 7 and 8 relate to compositions containing SEPS or SEEPS in place of the block copolymer A, and the liquid leakage resistance was poor.
- Comparative Example 9 relates to a composition in which high vinyl SEBS was blended in place of the block copolymer A, and the liquid leakage resistance and needle retention were poor.
- Comparative Example 10 relates to a composition containing a comparative softening agent having a low kinematic viscosity instead of the softening agent B, and the liquid leakage resistance and needle retention were poor.
- the ratio of the block copolymer A and the block copolymer P was related to a composition outside the range, and the liquid leakage resistance was somewhat poor.
- Comparative Example 12 was related to a composition in which a comparative block copolymer P ′ having a small Mw was blended in place of the block copolymer P, and the heat resistance was poor.
- Comparative Examples 13 to 15 relate to compositions containing a comparative olefin polymer in place of the propylene polymer C, and the liquid leakage resistance and needle retention were extremely poor.
- the composition of the present invention can be molded by a known method such as injection molding, extrusion molding or press molding.
- the molded body obtained using the composition of the present invention has excellent heat resistance, liquid leakage resistance and needle retention, which are important characteristics required for medical container stoppers, such as infusion bags and the like. It can be suitably used as a plug for medical containers.
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Abstract
Description
本発明は、上記耐熱性、耐液漏れ性および針保持性が優れる成形体を与える組成物を提供することを目的とする。
ブロック共重合体Aを50~95質量部、
ブロック共重合体Pを5~50質量部(ただし、ブロック共重合体Aおよびブロック共重合体Pの合計量は100質量部である)、
40℃における動粘度が50~500cStである軟化剤Bを100~300質量部、および
曲げ弾性率が1000~3000MPaであるプロピレン重合体Cを1~50質量部含有する組成物である。
上記ブロック共重合体Aは、
ブタジエン単量体単位を主要構成単位として含有し該ブタジエン単量体単位における1,2-結合の割合が10~50%である重合体ブロックY1を1個有し、
上記重合体ブロックY1の両末端に各1個合計2個のスチレン単量体単位を主要構成単位として含有する重合体ブロックX1を有する
ブロック共重合体Z1の水素添加物であり、
重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が20~50質量%であるブロック共重合体である。
上記ブロック共重合体Pは、
ブタジエン-スチレン制御分布共重合体ブロックY2を1個有し、
上記共重合体ブロックY2の両末端に各1個合計2個のポリスチレンブロックX2を有する
ブロック共重合体Z2の水素添加物であり、
重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が40~70質量%であるブロック共重合体である。
ブロック共重合体Z2の構成成分であるブタジエン-スチレン制御分布共重合体ブロックY2は、
ブタジエン単量体単位を主要構成単位として含有する領域YB2を2個以上有し、
スチレン単量体単位を主要構成単位として含有する領域YS2を1個以上有し、
両末端は領域YB2であるブタジエン-スチレン共重合体ブロックである。
請求項3に記載の発明の医療容器栓体用エラストマー組成物は、請求項1または2に記載の組成物において、JIS K6253に準じて測定された測定時間1秒のA硬さが30~50であることを特徴とする。
分子量は、ゲルパーミエーションクロマトグラフ(以下、GPCともいう。)により測定されたポリスチレン換算のものである。重量平均分子量のことをMwともいい、数平均分子量のことをMnともいう。
まず、本発明の組成物について、必須成分であるブロック共重合体A、ブロック共重合体P、軟化剤B、およびプロピレン重合体C、ならびに任意成分の順に説明する。
ブロック共重合体Aは、ブロック共重合体Z1の水素添加物であり、重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が20~50質量%であるブロック共重合体である。
ブロック共重合体Z1は、ブタジエン単量体単位を主要構成単位として含有し該ブタジエン単量体単位における1,2-結合の割合が10~50%である重合体ブロックY1を1個有し、重合体ブロックY1の両末端に各1個合計2個のスチレン単量体単位を主要構成単位として含有する重合体ブロックX1を有するブロック共重合体である。
重合体ブロックX1は、本発明の組成物が性能を損なわない範囲でスチレン単量体単位以外のビニル単量体単位を含有してもよい。重合体ブロックX1を構成する全単量体単位のうち、スチレン単量体単位の割合は80質量%以上が好ましく、90質量%以上がより好ましく、95質量%以上がさらに好ましい。スチレン単量体単位の割合が不足すると、得られる成形体は耐熱性が悪いものとなる。
主要構成単位がイソプレンまたはイソプレンとブタジエンの併用である場合は、得られる成形体は耐液漏れ性が悪いものとなる。また、主要構成単位がイソブチレンである場合は、得られる成形体は耐熱性が悪いものとなる。
ブロック共重合体Z1は、構成重合体ブロックとして上記重合体ブロックX1を10~60質量%有するものが好ましく、20~50質量%有するものがより好ましい。上記重合体ブロックX1の割合が少なすぎると得られる成形体が耐熱性の不十分なものとなる場合があり、上記重合体ブロックX1の割合が多すぎると組成物のゴム弾性が不足し、得られる成形体は耐液漏れ性が悪いものとなる場合がある。
本明細書においては当業者の慣行に基づき、1,2-結合のブタジエン単量体単位(1,3-ブタジエンが1,2-付加して生成したブタジエン単量体単位)に由来する構成単位「-CH2-CH(C2H5)-」をブチレン単位といい、1,4-結合のブタジエン単量体単位(1,3-ブタジエンが1,4-付加して生成したブタジエン単量体単位)に由来する構成単位「-CH2-CH2-CH2-CH2-」をエチレン単位(エチレン単位2個に見立てる)という。
上記SEBSにおいて、2個のSブロックに挟まれたブロックはEBブロックであることが、組成物を使用して得られる成形体の耐液漏れ性を優れたものとするために、極めて重要な作用をしていることが推察される。すなわち、スチレン単量体単位を主要構成単位として含有する2個のSブロックに挟まれたブロックは、1,2-結合のブタジエン単量体単位に由来する構成単位「-CH2-CH(C2H5)-」および1,4-結合のブタジエン単量体単位に由来する構成単位「-CH2-CH2-CH2-CH2-」を主要構成単位として含有するものであることが重要である。
上記ブロック共重合体AのMwは16~40万であり、20~35万であることが好ましい。Mwが小さすぎると得られる成形体は耐熱性が不十分なものとなる。Mwが大きすぎると得られる成形体は耐液漏れ性(後述する金属針を使用する混注想定試験)が不十分なものとなるため、使用が制限される。
上記ブロック共重合体Aは2種類以上が併用されてもよい。
上記ブロック共重合体Pは、下記のブロック共重合体Z2が水素添加されたものであり、重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が40~70質量%であるブロック共重合体である。
ブロック共重合体Z2は、ブタジエン-スチレン制御分布共重合体ブロックY2を1個有し、共重合体ブロックY2の両末端に各1個合計2個のポリスチレンブロックX2を有するブロック共重合体である。
上記制御分布共重合体ブロックとは、該共重合体ブロックを構成する複数の単量体単位の割合が異なる領域を有する共重合体ブロックを意味する。
上記ポリスチレンブロックX2は、該ブロックを構成する全単量体単位のうち、スチレン単量体単位の割合が90質量%以上であることが好ましく、95質量%以上であることがより好ましい。
ブタジエン単量体単位を主要構成単位として含有する領域YB2を2個以上有し、
スチレン単量体単位を主要構成単位として含有する領域YS2を1個以上有し、
両末端は領域YB2であるブタジエン-スチレン共重合体ブロックである。
主要構成単位がイソプレンまたはイソプレンとブタジエンの併用である場合は、得られる成形体は耐液漏れ性が悪いものとなる。また、主要構成単位がイソブチレンである場合は、得られる成形体は耐熱性が悪いものとなる。
上記領域YB2は、本発明の組成物が性能を損なわない範囲でブタジエン単量体単位以外のビニル単量体単位を含有してもよい。上記領域YB2を構成する全単量体単位のうち、ブタジエン単量体単位の割合は50質量%を超える必要があり、60質量%以上が好ましく、70質量%以上がより好ましく、80質量%以上がさらに好ましい。ブタジエン単量体単位の割合が不足すると、組成物のゴム弾性が不足し、得られる成形体は耐液漏れ性が悪いものとなる。ブタジエン単量体単位以外のビニル単量体単位は実質的にスチレン単量体単位であることが好ましい。
上記領域YS2は、本発明の組成物が性能を損なわない範囲でスチレン単量体単位以外のビニル単量体単位を含有してもよい。上記領域YS2を構成する全単量体単位のうち、スチレン単量体単位の割合は50質量%を超える必要があり、60質量%以上が好ましく、70質量%以上がより好ましく、80質量%以上がさらに好ましい。スチレン単量体単位の割合が不足すると、得られる成形体は耐熱性が悪いものとなる。スチレン単量体単位以外のビニル単量体単位は実質的にブタジエン単量体単位であることが好ましい。
上記領域YS2も、該領域がブロックと見立てることができるものであってもよい。
上記領域YB2および上記領域YS2の両者について、それぞれの領域がブロックと見立てることができるものである場合、ブタジエン-スチレン制御分布共重合体ブロックY2は、それ自身をブロック共重合体として扱うことができる。
上記ブロック共重合体Aのモデル的構造「S-EB-S」に対して、上記ブロック共重合体Pはモデル的構造の一例として「S-EB-S-EB-S」で表されるような重合体を包含する。
スチレン単量体単位の割合が多すぎると組成物のゴム弾性が不足し、得られる成形体は耐液漏れ性が悪いものとなる。
上記ブロック共重合体PのMwは16~40万であり、20~35万であることが好ましい。Mwが小さすぎると得られる成形体は耐熱性が不十分なものとなる。耐熱性が不十分であると滅菌などの加熱処理時に成形体が変形する場合がある。
Mwが大きすぎると得られる成形体は耐液漏れ性(後述する金属針を使用する混注想定試験)が不十分なものとなるため、使用が制限される。
上記ブロック共重合体Pは2種類以上が併用されてもよい。
上記プロピレン重合体Cは、プロピレン単量体単位を主要構成単位として含有する重合体であり、プロピレンの単独重合体であってもよいし、成形体の性能を損なわない範囲の割合でプロピレン以外のラジカル重合性単量体が共重合された共重合体であってもよい。共重合体の場合、プロピレン単量体単位の割合は70質量%以上が好ましく、80質量%以上がより好ましく、90質量%以上がさらに好ましい。実質的にプロピレンの単独重合体であることが最も好ましい。プロピレン単量体単位の割合が不足すると、得られる成形体は耐液漏れ性および針保持性が悪いものとなる。上記プロピレン重合体Cは2種類以上が併用されてもよい。
任意成分が配合される場合の配合割合は、組成物および成形体の性能を損なわない範囲で適宜決められる。
混合には、ヘンシェルミキサー、リボンブレンダー、V型ブレンダー等を使用することができる。
混練には、押出機、ミキシングロール、ニーダー、バンバリーミキサー、ブラベンダープラストグラフ等を使用することができる。
例えば、粉末状又はペレット状の固体主原料(成分A、P、C)を混合機で攪拌、混合(ドライブレンド)し、次いで液状主原料(成分B)を添加して攪拌、混合し(成分A、P、Cに成分Bを含浸させ)、必要に応じてその他の原料を添加して攪拌、混合することによって配合粉を得る。得られた配合粉を押出機で混練してペレット化するという方法は好ましい組成物の調製方法である。
上記手順において、「その他の原料」も固体主原料(成分A、P、C)と合わせて最初から添加する方法が採用されてもよい。
本発明の組成物の成形は、射出成形機、押出成形機、プレス成形機等の公知の成形機を使用して行うことができる。
本発明の組成物を成形して得られる成形体は、医療容器用の栓体に要求される重要特性である耐熱性、耐液漏れ性および針保持性が優れたものである。従って、本発明の組成物を成形して得られる成形体は、医療容器用の栓体として好適に使用することができる。
使用された原料は以下のとおりである。
1.ブロック共重合体Aおよび比較用ブロック共重合体A’
・ブロック共重合体A1:G1651(クレイトン製水添ブロック共重合体SEBS、スチレン単量体単位含有割合:33質量%、Mw:29万、Mn:26万、ブタジエン単量体単位における1,2-結合の割合:37%)
・ブロック共重合体A2:セプトン8006(株式会社クラレ製水添ブロック共重合体SEBS、スチレン単量体単位含有割合:33質量%、Mw:28万、Mn:26万、ブタジエン単量体単位における1,2-結合の割合:36%)
・比較用ブロック共重合体A’1:G1650(クレイトン製水添ブロック共重合体SEBS、スチレン単量体単位含有割合:29質量%、Mw:11万、Mn:10万、ブタジエン単量体単位における1,2-結合の割合:37%)
・比較用ブロック共重合体A’2:G1633(クレイトン製水添ブロック共重合体SEBS、スチレン単量体単位含有割合:30質量%、Mw:45万、Mn:40万、ブタジエン単量体単位における1,2-結合の割合:37%)
・比較用ブロック共重合体A’3:セプトン4055(株式会社クラレ製水添ブロック共重合体SEEPS、スチレン単量体単位含有割合:30質量%、Mw:30万、Mn:28万、ジエン単量体単位における1,2-結合の割合:約37%)
・比較用ブロック共重合体A’4:セプトン2006(株式会社クラレ製水添ブロック共重合体SEPS、スチレン単量体単位含有割合:35質量%、Mw:32万、Mn:29万、ジエン単量体単位における1,2-結合の割合:約37%)
・比較用ブロック共重合体A’5:G1641(クレイトン製ハイビニル水添ブロック共重合体SEBS、スチレン単量体単位含有割合:32質量%、Mw:24万、Mn:22万、ブタジエン単量体単位における1,2-結合の割合:67%)
・ブロック共重合体P1:RP6935(クレイトン製水添ブロック共重合体マルチブロックSEBS、スチレン単量体単位含有割合:58%、Mw:27万、Mn:25万)
・比較用ブロック共重合体P’1:RP6936(クレイトン製水添ブロック共重合体マルチブロックSEBS、スチレン単量体単位含有割合:39%、Mw:15万、Mn:14万)
・ポンプ:JASCO(日本分光株式会社)製PU-980
・カラムオーブン:昭和電工株式会社製AO-50
・検出器:日立製RI(示差屈折計)検出器L-3300
・カラム種類:昭和電工株式会社製「K-805L(8.0×300mm)」および「K-804L(8.0×300mm)」各1本を直列使用
・カラム温度:40℃
・ガードカラム:K-G(4.6×10mm)
・溶離液:クロロホルム
・溶離液流量:1.0ml/分
・試料濃度:約1mg/ml
・試料溶液ろ過:ポリテトラフルオロエチレン製0.45μm孔径ディスポーザブルフィルタ
・検量線用標準試料:昭和電工株式会社製ポリスチレン
・軟化剤B1:ケイドール(Sonneborn製オイル、40℃における動粘度:64~70cSt)
・軟化剤B’1:マーコールN172(エクソンモービル製オイル、40℃における動粘度:33cSt)
・プロピレン重合体C1:PM600A(サンアロマー株式会社製ポリプロピレン、曲げ弾性率:1600MPa、MFR(メルトフローレート):7.5g/10分)
・比較用オレフィン重合体C’1:PH943B(サンアロマー株式会社製プロピレン重合体、曲げ弾性率:550MPa、MFR(メルトフローレート):21g/10分)
・比較用オレフィン重合体C’2:J5900(株式会社プライムポリマー製ポリプロピレン、曲げ弾性率:420MPa、MFR(メルトフローレート):8g/10分)
・比較用オレフィン重合体C’3:ニポロンハード1000(東ソー製HDPE(高密度ポリエチレン)、曲げ弾性率:1160MPa、MFR(メルトフローレート):20g/10分、密度:964kg/m3)
なお、MFR(メルトフローレート)はJIS K 7210に基づき、230℃、荷重2.16kg(21.2N)の条件で測定された値である。
・その他のブロック共重合体D1:G1641(クレイトン製ハイビニル水添ブロック共重合体SEBS、スチレン単量体単位含有割合:32%、Mw:24万、Mn:22万、ブタジエン単量体単位における1,2-結合の割合:67%)
(比較用ブロック共重合体A’5と同一の重合体であるが、任意成分として配合された場合は便宜上D1という。)
上記原料を使用して、本発明の組成物および比較用組成物を製造した。配合割合(質量部)は表1~2(実施例)および表3~4(比較例)のとおりである。
固体状原料(軟化剤Bおよび比較用軟化剤B’以外の成分)を混合(ドライブレンド)して固体原料混合物を調製し、該混合物に液状原料(軟化剤Bまたは比較用軟化剤B’)を添加して混合、含浸させて原料混合物を調製した。該原料混合物を下記の条件で押出機で溶融混練して、組成物のペレットを製造した。
・押出機:株式会社テクノベル製 KZW32TW-60MG-NH
・シリンダー温度:250~300℃(この範囲で組成物毎に適切な温度を選択)
・スクリュー回転数:300rpm
組成物のペレットを下記の条件で射出成形して、長さ125mm、幅125mm、厚さ2mmのプレート状成形体および長さ125mm、幅25mm、厚さ6mmのバー状成形体を製造した。バー状成形体からの打ち抜きにより直径20mm(厚さ6mm)の円柱状成形体を製造し、栓体としての評価はこれを使用した。
・射出成形機:三菱重工業株式会社製 100MSIII-10E
・成形温度:170℃
・射出圧力:成形機の最大能力の30%(実際の圧力は約600kgf/cm2)
・射出時間:10秒
・金型温度:40℃
上記の成形体について以下の評価を行った。
評価結果を表1~2(実施例)および表3~4(比較例)に示した。
厚さ2mmの成形体を3枚重ね(合計6mm)としたものについて、JIS K6253に準拠した測定時間1秒のA硬さ(試験開始から1秒後の値)を測定した。測定は温度23℃、湿度50%の室内で1日状態調節の後実施した。好ましいA硬さは30~50である。
円柱状成形体を110℃のオーブン中に30分間静置して加熱滅菌の処理を行った。変形の有無を目視にて評価した。
○:変形は認められなかった。
×:変形が認められた。
液貯槽および液貯槽の底部に栓体取付部位を備える液漏れ試験機に栓体(円柱状成形体)をセットし、液貯槽に水500mlを注ぎ、栓体の平面に0.01MPaの水圧がかかるようにした。評価は温度23℃、湿度50%の室内で行った。
上記栓体の中心に栓体の下方から栓体平面と垂直に、医療用プラスチック針(テルモ株式会社製TC-00503K)を挿入し、2時間静置した。プラスチック針自身の貫通孔は、該貫通孔からの液漏れが起きないように封止されたものを使用した。2時間後にプラスチック針を栓体から抜き、栓体に生じた針穴からの液漏れ(水漏れ)状態を1時間後に目視にて評価した。評価は20個の栓体について行った。
○:にじみ、液漏れともに認められなかった。
△:にじみは認められたが、液漏れは認められなかった。
×:液漏れが認められた。
液貯槽および液貯槽の底部に栓体取付部位を備える液漏れ試験機に栓体(円柱状成形体)をセットし、液貯槽に水500mlを注ぎ、栓体の平面に0.01MPaの水圧がかかるようにした。評価は温度23℃、湿度50%の室内で行った。
上記栓体の中心に栓体の下方から栓体平面と垂直に、注射器に取付られた医療用金属針(テルモ株式会社製18G)を挿入し、注射器および金属針を約30度傾け、15秒後に傾けたまま金属針を栓体から抜いた。
上記と同じ金属針の栓体への挿入操作および栓体から抜く操作をもう一度繰り返し行った。2回目も1回目と同一の注射器および金属針を使用し、2回目の挿入も1回目の挿入と同じ箇所に行った。2回目の金属針を抜く操作終了後、栓体に生じた針穴からの液漏れ(水漏れ)状態を1時間後に目視にて評価した。評価は20個の栓体について行った。
○:にじみ、液漏れともに認められなかった。
△:にじみは認められたが、液漏れは認められなかった。
×:液漏れが認められた。
試験用架台に栓体(円柱状成形体)の平面が水平面と平行になるように栓体をセットした。評価は温度23℃、湿度50%の室内で行った。
上記栓体の中心に栓体の下方から栓体平面と垂直に、500gのおもりが取付られた医療用金属針(テルモ株式会社製TC-00501K)を挿入し、金属針を挿入してから抜け落ちるまでの時間(針保持時間、単位は秒)を測定した。針保持時間は100秒以上が好ましく、120秒以上がより好ましい。
比較例2は、軟化剤Bの使用割合が少なすぎる組成物に関するものであり、耐液漏れ性が極めて悪いものであった。
比較例3は、軟化剤Bの使用割合が多すぎる組成物に関するものであり、針保持性が極めて悪く、耐液漏れ性も悪いものであった。
比較例4は、プロピレン重合体Cの使用割合が多すぎる組成物に関するものであり、耐液漏れ性が極めて悪いものであった。
比較例5は、ブロック共重合体Aに替えてMwが小さい比較用ブロック共重合体A’が配合された組成物に関するものであり、耐熱性が悪いものであった。
比較例6は、ブロック共重合体Aに替えてMwが大きい比較用ブロック共重合体A’が配合された組成物に関するものであり、針保持性および耐液漏れ性2(混注想定試験)が悪いものであった。
比較例7および8は、ブロック共重合体Aに替えてSEPSまたはSEEPSが配合された組成物に関するものであり、耐液漏れ性が悪いものであった。
比較例9は、ブロック共重合体Aに替えてハイビニルSEBSが配合された組成物に関するものであり、耐液漏れ性および針保持性が悪いものであった。
比較例10は、軟化剤Bに替えて動粘度が低い比較用軟化剤が配合された組成物に関するものであり、耐液漏れ性および針保持性が悪いものであった。
比較例11は、ブロック共重合体Aとブロック共重合体Pの割合が範囲外の組成物に関するものであり、耐液漏れ性がやや悪いものであった。
比較例12は、ブロック共重合体Pに替えてMwが小さい比較用ブロック共重合体P’が配合された組成物に関するものであり、耐熱性が悪いものであった。
比較例13~15は、プロピレン重合体Cに替えて比較用オレフィン重合体が配合された組成物に関するものであり、耐液漏れ性および針保持性が極めて悪いものであった。
Claims (3)
- ブロック共重合体Aが50~95質量部、ブロック共重合体Pが5~50質量部であって、上記ブロック共重合体Aと上記ブロック共重合体Pとの合計量が100質量部と、
40℃における動粘度が50~500cStである軟化剤Bを100~300質量部と、
曲げ弾性率が1000~3000MPaであるプロピレン重合体Cを1~50質量部と、
を含有するエラストマー組成物であって、
上記ブロック共重合体Aは、
ブタジエン単量体単位を主要構成単位として含有し該ブタジエン単量体単位における1,2-結合の割合が10~50%である重合体ブロックY1を1個有し、
上記重合体ブロックY1の両末端に各1個合計2個のスチレン単量体単位を主要構成単位として含有する重合体ブロックX1を有する
ブロック共重合体Z1の水素添加物であり、
重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が20~50質量%であるブロック共重合体であり、
上記ブロック共重合体Pは、
ブタジエン-スチレン制御分布共重合体ブロックY2を1個有し、
上記共重合体ブロックY2の両末端に各1個合計2個のポリスチレンブロックX2を有する
ブロック共重合体Z2の水素添加物であり、
重量平均分子量が16~40万であり、スチレン単量体単位の含有割合が40~70質量%であるブロック共重合体であり、
上記ブタジエン-スチレン制御分布共重合体ブロックY2は、
ブタジエン単量体単位を主要構成単位として含有する領域YB2を2個以上有し、
スチレン単量体単位を主要構成単位として含有する領域YS2を1個以上有し、
両末端は上記領域YB2であるブタジエン-スチレン共重合体ブロックである
ことを特徴とする医療容器栓体用エラストマー組成物。 - プロピレン重合体Cはポリプロピレンである請求項1に記載の医療容器栓体用エラストマー組成物。
- 上記エラストマー組成物のJIS K6253に準じて測定された測定時間1秒のA硬さが30~50である請求項1または2に記載の医療容器栓体用エラストマー組成物。
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CN2010800096926A CN102256584A (zh) | 2009-03-13 | 2010-03-04 | 医疗容器塞子用弹性体组成物 |
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JP2012025944A (ja) * | 2010-06-22 | 2012-02-09 | Mitsubishi Chemicals Corp | 医療用ゴム栓 |
US20140348890A1 (en) * | 2011-05-19 | 2014-11-27 | Lohmann & Rauscher Gmbh & Co. Kg | Wound dressing |
JP2015019750A (ja) * | 2013-07-17 | 2015-02-02 | アロン化成株式会社 | 医療容器栓体用熱可塑性エラストマー組成物 |
WO2017150714A1 (ja) * | 2016-03-03 | 2017-09-08 | Mcppイノベーション合同会社 | エラストマー組成物およびそれを成形してなる医療容器栓体 |
JPWO2017150714A1 (ja) * | 2016-03-03 | 2018-12-27 | Mcppイノベーション合同会社 | エラストマー組成物およびそれを成形してなる医療容器栓体 |
US11718755B2 (en) | 2016-03-03 | 2023-08-08 | Mcpp Innovation Llc | Elastomer composition and medical container stopper formed by molding same |
Also Published As
Publication number | Publication date |
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CN102256584A (zh) | 2011-11-23 |
US20120059108A1 (en) | 2012-03-08 |
ES2628119T3 (es) | 2017-08-01 |
JPWO2010103988A1 (ja) | 2012-09-13 |
EP2407140A1 (en) | 2012-01-18 |
EP2407140A4 (en) | 2013-05-01 |
EP2407140B1 (en) | 2017-05-03 |
JP5199456B2 (ja) | 2013-05-15 |
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