JPS6113489B2 - - Google Patents
Info
- Publication number
- JPS6113489B2 JPS6113489B2 JP3587681A JP3587681A JPS6113489B2 JP S6113489 B2 JPS6113489 B2 JP S6113489B2 JP 3587681 A JP3587681 A JP 3587681A JP 3587681 A JP3587681 A JP 3587681A JP S6113489 B2 JPS6113489 B2 JP S6113489B2
- Authority
- JP
- Japan
- Prior art keywords
- cellulose acetate
- parts
- weight
- plasticizer
- phthalate
- 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.)
- Expired
Links
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 32
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 claims description 32
- 239000004014 plasticizer Substances 0.000 claims description 25
- 229920002301 cellulose acetate Polymers 0.000 claims description 24
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 15
- 238000005520 cutting process Methods 0.000 description 7
- -1 dimethoxyhexyl phthalate Chemical compound 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 2
- UYXTWWCETRIEDR-UHFFFAOYSA-N Tributyrin Chemical compound CCCC(=O)OCC(OC(=O)CCC)COC(=O)CCC UYXTWWCETRIEDR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000012461 cellulose resin Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- URAYPUMNDPQOKB-UHFFFAOYSA-N triacetin Chemical compound CC(=O)OCC(OC(C)=O)COC(C)=O URAYPUMNDPQOKB-UHFFFAOYSA-N 0.000 description 2
- WMYINDVYGQKYMI-UHFFFAOYSA-N 2-[2,2-bis(hydroxymethyl)butoxymethyl]-2-ethylpropane-1,3-diol Chemical compound CCC(CO)(CO)COCC(CC)(CO)CO WMYINDVYGQKYMI-UHFFFAOYSA-N 0.000 description 1
- PZBLUWVMZMXIKZ-UHFFFAOYSA-N 2-o-(2-ethoxy-2-oxoethyl) 1-o-ethyl benzene-1,2-dicarboxylate Chemical compound CCOC(=O)COC(=O)C1=CC=CC=C1C(=O)OCC PZBLUWVMZMXIKZ-UHFFFAOYSA-N 0.000 description 1
- YJERZJLSXBRUDQ-UHFFFAOYSA-N 2-o-(3,4-dihydroxybutyl) 1-o-methyl benzene-1,2-dicarboxylate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OCCC(O)CO YJERZJLSXBRUDQ-UHFFFAOYSA-N 0.000 description 1
- JLLYLQLDYORLBB-UHFFFAOYSA-N 5-bromo-n-methylthiophene-2-sulfonamide Chemical compound CNS(=O)(=O)C1=CC=C(Br)S1 JLLYLQLDYORLBB-UHFFFAOYSA-N 0.000 description 1
- GOJCZVPJCKEBQV-UHFFFAOYSA-N Butyl phthalyl butylglycolate Chemical compound CCCCOC(=O)COC(=O)C1=CC=CC=C1C(=O)OCCCC GOJCZVPJCKEBQV-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical class OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 1
- 229930195725 Mannitol Natural products 0.000 description 1
- YSMRWXYRXBRSND-UHFFFAOYSA-N TOTP Chemical compound CC1=CC=CC=C1OP(=O)(OC=1C(=CC=CC=1)C)OC1=CC=CC=C1C YSMRWXYRXBRSND-UHFFFAOYSA-N 0.000 description 1
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 230000021736 acetylation Effects 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 150000001278 adipic acid derivatives Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001535 azelaic acid derivatives Chemical class 0.000 description 1
- HSUIVCLOAAJSRE-UHFFFAOYSA-N bis(2-methoxyethyl) benzene-1,2-dicarboxylate Chemical compound COCCOC(=O)C1=CC=CC=C1C(=O)OCCOC HSUIVCLOAAJSRE-UHFFFAOYSA-N 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229940105990 diglycerin Drugs 0.000 description 1
- GPLRAVKSCUXZTP-UHFFFAOYSA-N diglycerol Chemical compound OCC(O)COCC(O)CO GPLRAVKSCUXZTP-UHFFFAOYSA-N 0.000 description 1
- FBSAITBEAPNWJG-UHFFFAOYSA-N dimethyl phthalate Natural products CC(=O)OC1=CC=CC=C1OC(C)=O FBSAITBEAPNWJG-UHFFFAOYSA-N 0.000 description 1
- 229960001826 dimethylphthalate Drugs 0.000 description 1
- 238000002845 discoloration Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002314 glycerols Chemical class 0.000 description 1
- 239000001087 glyceryl triacetate Substances 0.000 description 1
- 235000013773 glyceryl triacetate Nutrition 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 239000000594 mannitol Substances 0.000 description 1
- 235000010355 mannitol Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical class OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 239000003549 soybean oil Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 150000003458 sulfonic acid derivatives Chemical class 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- LMYRWZFENFIFIT-UHFFFAOYSA-N toluene-4-sulfonamide Chemical compound CC1=CC=C(S(N)(=O)=O)C=C1 LMYRWZFENFIFIT-UHFFFAOYSA-N 0.000 description 1
- 229960002622 triacetin Drugs 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- 239000000052 vinegar Substances 0.000 description 1
- 235000021419 vinegar Nutrition 0.000 description 1
Description
【発明の詳細な説明】
本発明は寸法案定性の改良された酢酸繊維素樹
脂成形物に関する。酢酸繊維素樹脂は光沢、強靭
性、触感の良さ、汚れが付きにくいといつた特性
を有し、さらに切削性が良い熱加工がしやすいと
いつた加工性が非常に優れたいるため、眼鏡枠等
の成形物の材料として好適に使用されている。し
かし大きな欠点を一つに、熱及び吸湿により寸法
が変化しやすい欠点があり、この寸法安定性が望
まれていた。
従つて、本発明は酢酸繊維素樹脂製の眼鏡枠等
の成形物の寸法安定性の改善を図るべく鋭意検討
した結果、本発明に到達した。
すなわち、本発明は含有可塑剤のトータル量が
酢酸繊維素100重量部に対し30重量部から40重量
部の範囲にあり、含有可塑剤の80％以上が下記の
比率を満足するように配合された。
ジブチルフタレート／ジエチルフタレート＝
0.1／１〜0.3／１
ことを特徴とする酢酸繊維素樹脂成形物である。
本発明で使用するジブチルフタレートはイソフ
タル酸とブタノールをエステル反応させて製造さ
れる可塑剤であり、酢酸繊維素と相溶性があるも
のの、満足できるものでなく、単独で使用した場
合、表面に浸み出る傾向（ブリード性）にあり、
なんら可塑剤としての優れた点を有したおらず、
一般的には酢酸繊維素樹脂の可塑剤としては使用
されていないのが実状であつた。
しかし、本発明者は鋭意、研究努力した結果、
通常酢酸繊維素樹脂の可塑剤として使用されてい
るジエチルフタレートに、ごく限られた範囲で、
ジブチルフタレートを混合し、酢酸繊維素樹脂の
可塑剤として使用することにより、従来より大き
な問題であつた酢酸繊維素樹脂製の眼鏡枠等の成
形物を寸法安定性を著しく改善するという知見を
得、本発明を完成させた。
本発明で使用する酢酸繊維素は繊維素（セルロ
ース）の水酸基の一部または全部を酢酸でエステ
ル化したものであり、通常酢酸繊維素樹脂に使用
されているものならば、その重合度及び酢化度は
任意であるが、通常は重合度が100〜200、酢化度
が50％〜56％のものを使用する。
本発明で使用するジエチルフタレートはイソフ
タル酸とエタノールをエステル化反応して製造さ
れる可塑剤である。
本発明では少量の他の可塑剤を使用することが
できるが、その可塑剤としては、ジメチルフタレ
ート、ジメトオキシエチルフタレート、ジメトオ
キシヘキシルフタレート等のフタル酸エステル、
リン酸トリフエニル、リン酸トリクレジル等のリ
ン酸エステル、トリアセチン、トリブチリン等の
グリセリン誘導体、メチルフタリルエチルグリコ
レート、エチルフタリルエチルグリコレート、ブ
チルフタリルブチルグリコレート等のグリコール
酸誘導体、Ｐ−トルエンスルホンアミド、トルエ
ンスルホン−Ｎ−エチルアミド、エチルアミド等
のスルホン酸誘導体、その他アジピン酸誘導体、
アゼライン酸誘導体、ジグリセリン、ボリグリセ
リン、ペンタエリスリトール、ジベンタエリスリ
トール、トリメチロールプロパン、トリメチロー
ルエタン、ジトリエチロールエタン、ジトリメチ
ロールプロパン、ソルビトール、マニトール及び
トリス（２−ヒドロキシルエチル）イソシアヌレ
ートなどの多価アルコール低級脂肪酸エステル、
１，２，３ブタントリカルボン酸トリエステル、
ビスフエノールＡ型エポキシ樹脂等の通常酢酸繊
維素樹脂に使用される可塑剤が使用できる。
酢酸繊維素樹脂は熱成形時の熱劣化防止、熱着
色防止の為各種安定剤が添加されているが、本発
明で使用する酢酸繊維素樹脂にも亜リン酸エステ
ル、エポキシ化大豆油、エポキシ樹脂ヒンダード
フエノール、チオエーテル等の一般市販安定剤を
熱劣化防止、熱着色防止の為に必要量添加するこ
とができる。
更に所望する色に着色するために用いる染料、
顔料としては公知の酢酸繊維素樹脂用の染料、顔
料を用いればよい。又、目的に応じて各種の充填
剤を添加しても差支えない。
本発明において含有可塑剤の80％以上が
ジブチルフタレート／ジエチルフタレート＝
0.1／１〜0.3／１
の比率にあることが必要であり、ジブチルフタレ
ート／ジエチルフタレート＝0.1／１、より小さ
い場合は眼鏡枠等の成形物にした場合の寸法安定
性の効果が出ず、又ジブチルフタレート／ジエチ
ルフタレート＝0.3／１、より大きい場合は眼鏡
枠等の成形物表面への可塑剤の浸み出しがあり、
共に適当でない。
本発明において使用する酢酸繊維素樹脂に含有
される可塑剤の量は酢酸繊維100重量部に対し30
重量部から40重量部である。可塑剤の量が30重量
部以下であると、眼鏡枠等の成形物にした場合も
ろくなり、切削加工時に割れが発生する問題があ
る。又、40重量部以上の場合、熱及び吸湿による
寸法変化の度合が大きくなり、本発明の効果がで
ないという問題がある。
本発明に使用する酢酸繊維素樹脂に含有される
可塑剤80％以上はジブチルフタレート及びジエチ
ルフタレートから構成されている必要がある。ジ
ブチルフタレートとジエチルフタレートの含有率
が80％以下の場合、本発明の効果である眼鏡枠等
の成形物の寸法安定性を向上さすことができない
等種々の悪影響がでるため適当でない。
本発明における眼鏡枠等の成形物の製造方法と
しては公知の技術にて製造すればよいが、通常以
下の如き方法による。
１ 熱溶融後型に注入し、成形物を得るいわゆる
射出成形法。
２ 湿式法又はブロツク法と呼ばれる方法で、板
状酢酸繊維素樹脂成形物を得て必要に応じて切
削、切断、曲げ、接着等の加工をする方法。
３ 押出し成形と呼ばれる方法で、酢酸繊維素樹
脂を加熱溶融し、板状の成形物を得て必要に応
じて切削、切断、曲げ、接着等の加工をする方
法。
以下実施例により説明する。
実施例 １〜３、比較例 １〜４
第１表に示した種類及び量の可塑剤を含有する
厚さ8m／ｍの酢酸繊維素樹脂（酢化度54.8％、
重合度170）製押出板を市販の眼鏡枠切削機（眼
鏡枠自動切削機、田河製作所製）にて眼鏡枠に切
削し、切削加工性を調べ、その評価結果を第１表
に示した。
次に切削加工した眼鏡枠を70℃×80％RHの温
度及び湿度を一定状態に保つことのできる恒温恒
湿槽に静置し、24時間放置した。その後取り出
し、可塑剤のブリード状態及び眼鏡枠の変形の度
合を肉眼により観察した。結果を第１表に示し
た。
第１表から明らかなように、実施例−１〜３は
含有可塑剤のトータル量が酢酸繊維素100重量部
に対し30重量部から40重量部の範囲にあり、含有
可塑剤の80％以上がジブチルフタレートとジエチ
ルフタレートの混合可塑剤であり、しかもジエチ
ルフタレートとジブチルフタレートの混合比率が
ジブチルフタレート／ジエチルフタレート＝
0.1／１〜0.3／１の範囲にあるため、眼鏡枠にす
る場合の切削性が良好で、又可塑剤のブリードが
なく、又熱及び湿度による変形の度合が非常に少
く。優れた眼鏡枠である。
比較例−１は含有可塑剤のトータル量が酢酸繊
維素100重量部に対し30重量部以下であるため、
切削性が悪い。
比較例−２はジブチルフタレートとジエチルフ
タレートの混合比率がジブチルフタレート／ジエ
チルフタレート＝0.3／１以上であるため、可塑
剤のブリードが発生した。
比較例−３は含有可塑剤のトータル量が酢酸繊
維素100重量部に対し、40重量部以上であるた
め、眼鏡枠が変形した。
比較例−４はジブチルフタレートとジエチルフ
タレートの混合比率がジブチルフタレート／ジエ
チルフタレート＝0.1／１以下であるため、眼鏡
枠が変形した。
【表】DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cellulose acetate resin molded article with improved dimensional stability. Cellulose acetate resin has properties such as gloss, toughness, good texture, and resistance to staining, and it also has excellent processability, such as good machinability and easy thermal processing, so it is used for eyeglasses. It is suitably used as a material for molded products such as frames. However, one major drawback is that the dimensions tend to change due to heat and moisture absorption, and dimensional stability has been desired. Therefore, the present invention was achieved as a result of intensive studies aimed at improving the dimensional stability of molded products such as eyeglass frames made of cellulose acetate resin. That is, in the present invention, the total amount of plasticizers contained is in the range of 30 parts by weight to 40 parts by weight per 100 parts by weight of cellulose acetate, and 80% or more of the plasticizers contained are blended so that the following ratio is satisfied. Ta. Dibutyl phthalate/diethyl phthalate =
This is a cellulose acetate resin molded product characterized by a ratio of 0.1/1 to 0.3/1. Dibutyl phthalate used in the present invention is a plasticizer produced by ester reaction of isophthalic acid and butanol, and although it is compatible with cellulose acetate, it is not satisfactory, and when used alone, it does not penetrate the surface. It has a tendency to ooze out (bleed),
It does not have any advantages as a plasticizer,
The reality is that it is generally not used as a plasticizer for cellulose acetate resin. However, as a result of diligent research efforts, the present inventor found that
To a very limited extent, diethyl phthalate, which is normally used as a plasticizer for cellulose acetate resin,
By mixing dibutyl phthalate and using it as a plasticizer for cellulose acetate resin, we have found that the dimensional stability of molded products such as eyeglass frames made of cellulose acetate resin, which has been a major problem in the past, can be significantly improved. , completed the invention. The cellulose acetate used in the present invention is obtained by esterifying some or all of the hydroxyl groups of cellulose with acetic acid, and if it is normally used for cellulose acetate resin, the polymerization degree and vinegar Although the degree of polymerization is arbitrary, those having a degree of polymerization of 100 to 200 and a degree of acetylation of 50% to 56% are usually used. Diethyl phthalate used in the present invention is a plasticizer produced by esterifying isophthalic acid and ethanol. Small amounts of other plasticizers may be used in the present invention, including phthalate esters such as dimethyl phthalate, dimethoxyethyl phthalate, dimethoxyhexyl phthalate;
Phosphate esters such as triphenyl phosphate and tricresyl phosphate, glycerin derivatives such as triacetin and tributyrin, glycolic acid derivatives such as methyl phthalyl ethyl glycolate, ethyl phthalyl ethyl glycolate, and butylphthalyl butyl glycolate, P-toluene Sulfonamide, toluenesulfone-N-ethylamide, sulfonic acid derivatives such as ethylamide, other adipic acid derivatives,
Azelaic acid derivatives, diglycerin, polyglycerin, pentaerythritol, diventaerythritol, trimethylolpropane, trimethylolethane, ditriethylolethane, ditrimethylolpropane, sorbitol, mannitol and tris(2-hydroxylethyl)isocyanurate. Hydrolic alcohol lower fatty acid ester,
1,2,3 butanetricarboxylic acid triester,
Plasticizers commonly used in acetic acid cellulose resins, such as bisphenol A type epoxy resins, can be used. Various stabilizers are added to cellulose acetate resin to prevent thermal deterioration and heat discoloration during thermoforming, but the cellulose acetate resin used in the present invention also contains phosphite, epoxidized soybean oil, and epoxy. General commercially available stabilizers such as resin-hindered phenols and thioethers can be added in necessary amounts to prevent thermal deterioration and thermal coloring. Dye used to further color the desired color,
As the pigment, known dyes and pigments for acetic acid cellulose resin may be used. Furthermore, various fillers may be added depending on the purpose. In the present invention, 80% or more of the plasticizer contained is dibutyl phthalate/diethyl phthalate=
It is necessary that the ratio be between 0.1/1 and 0.3/1, dibutyl phthalate/diethyl phthalate = 0.1/1, and if it is smaller, the effect of dimensional stability when molded into eyeglass frames etc. will not be obtained. In addition, if dibutyl phthalate/diethyl phthalate = 0.3/1 or greater, the plasticizer may seep into the surface of molded products such as eyeglass frames.
Both are inappropriate. The amount of plasticizer contained in the cellulose acetate resin used in the present invention is 30 parts by weight per 100 parts by weight of acetic acid fiber.
Parts by weight to 40 parts by weight. If the amount of plasticizer is less than 30 parts by weight, there is a problem that molded products such as eyeglass frames become brittle and cracks occur during cutting. Further, if the amount is 40 parts by weight or more, the degree of dimensional change due to heat and moisture absorption becomes large, and there is a problem that the effect of the present invention is not achieved. At least 80% of the plasticizer contained in the cellulose acetate resin used in the present invention must be composed of dibutyl phthalate and diethyl phthalate. If the content of dibutyl phthalate and diethyl phthalate is 80% or less, it is not suitable because various adverse effects may occur, such as not being able to improve the dimensional stability of molded products such as eyeglass frames, which is an effect of the present invention. In the present invention, a molded article such as an eyeglass frame may be manufactured by any known technique, but the following method is usually used. 1 A so-called injection molding method in which a molded product is obtained by hot melting and then injecting it into a mold. 2. A method called the wet method or block method, in which a plate-shaped cellulose acetate resin molded product is obtained and processed by cutting, cutting, bending, gluing, etc. as necessary. 3. A method called extrusion molding, in which cellulose acetate resin is heated and melted to obtain a plate-shaped molded product, which is then processed by cutting, cutting, bending, gluing, etc. as necessary. This will be explained below using examples. Examples 1 to 3, Comparative Examples 1 to 4 Cellulose acetate resin (acetic acid degree 54.8%,
An extruded plate made of polymerization degree 170) was cut into an eyeglass frame using a commercially available eyeglass frame cutting machine (automatic eyeglass frame cutting machine, manufactured by Tagawa Seisakusho), and its machinability was examined. The evaluation results are shown in Table 1. . Next, the cut eyeglass frames were placed in a constant temperature and humidity chamber (70°C x 80% RH) that could maintain constant temperature and humidity for 24 hours. Thereafter, it was taken out and the state of plasticizer bleed and the degree of deformation of the eyeglass frame were observed with the naked eye. The results are shown in Table 1. As is clear from Table 1, in Examples 1 to 3, the total amount of plasticizer contained was in the range of 30 to 40 parts by weight based on 100 parts by weight of cellulose acetate, which accounted for 80% or more of the plasticizer contained. is a mixed plasticizer of dibutyl phthalate and diethyl phthalate, and the mixing ratio of diethyl phthalate and dibutyl phthalate is dibutyl phthalate/diethyl phthalate =
Since it is in the range of 0.1/1 to 0.3/1, it has good machinability when making eyeglass frames, there is no bleeding of plasticizer, and the degree of deformation due to heat and humidity is very small. These are excellent eyeglass frames. In Comparative Example-1, the total amount of plasticizer contained was 30 parts by weight or less per 100 parts by weight of cellulose acetate.
Poor machinability. In Comparative Example 2, the mixing ratio of dibutyl phthalate and diethyl phthalate was dibutyl phthalate/diethyl phthalate = 0.3/1 or more, so bleeding of the plasticizer occurred. In Comparative Example 3, the total amount of plasticizer contained was 40 parts by weight or more based on 100 parts by weight of cellulose acetate, so the eyeglass frame was deformed. In Comparative Example 4, the mixing ratio of dibutyl phthalate and diethyl phthalate was less than 0.1/1 (dibutyl phthalate/diethyl phthalate), so the glasses frame was deformed. 【table】
Claims (1)
部に対し、30重量部から40重量部の範囲にあり、
含有可塑剤の80％以上が下記の比率を満足するよ
うに配合された。 ジブチルフタレート／ジエチルフタレート＝
0.1／１〜0.3／１ ことを特徴とする酢酸繊維素樹脂成形物。[Claims] 1. The total amount of plasticizer contained is in the range of 30 parts by weight to 40 parts by weight based on 100 parts by weight of cellulose acetate,
80% or more of the plasticizer contained was blended to satisfy the following ratio. Dibutyl phthalate/diethyl phthalate =
A cellulose acetate resin molded product characterized by a ratio of 0.1/1 to 0.3/1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3587681A JPS57149339A (en) | 1981-03-11 | 1981-03-11 | Cellulose acetate resin molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3587681A JPS57149339A (en) | 1981-03-11 | 1981-03-11 | Cellulose acetate resin molded article |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57149339A JPS57149339A (en) | 1982-09-14 |
| JPS6113489B2 true JPS6113489B2 (en) | 1986-04-14 |
Family
ID=12454194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3587681A Granted JPS57149339A (en) | 1981-03-11 | 1981-03-11 | Cellulose acetate resin molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57149339A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132103U (en) * | 1988-03-01 | 1989-09-07 |
-
1981
- 1981-03-11 JP JP3587681A patent/JPS57149339A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01132103U (en) * | 1988-03-01 | 1989-09-07 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57149339A (en) | 1982-09-14 |
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