METHOD FOR PRODUCING ONE-END FUNCTIONAL ORGANOPOLYSILOXANE, AND ONE-END FUNCTIONAL ORGANOPOLYSILOXANE COMPOSITION

• Main Authors: TOYODA TAKESHI, OKAMURA KAORU, HASHIMOTO RYUTA
• Format: Patent
• Language: English; Japanese
• Published: 18.10.2023
• Subjects: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM; CHEMISTRY; COMPOSITIONS BASED THEREON; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a production method for obtaining highly purified one-end functional organopolysiloxane.SOLUTION: This invention relates to a method for producing one-end functional organopolysiloxane having the following general formula (1), using cyclopolysiloxane having 3 to 5 silicon atoms as a raw material, wherein R1 is independently an alkyl group or a phenyl group, and A represents a hydrogen atom, a vinyl group linked by a single bond or an organic group, or a (meth)acrylate group linked by a single bond or an organic group. The one-end functional organopolysiloxane stops reaction when it reaches a reaction conversion of 60-95%, as determined by analyzing a reaction solution during the polymerization reaction using near-infrared spectroscopy.SELECTED DRAWING: None 【課題】高純度な片末端官能性オルガノポリシロキサンを得るための製造方法を提供する。【解決手段】ケイ素原子数３～５のシクロポリシロキサンを原料とし、下記一般式（１）TIFF2023153550000052.tif2177（式中、Ｒ１は独立してアルキル基、またはフェニル基であり、Ａは水素原子、単結合または有機基で連結されたビニル基、単結合または有機基で連結された（メタ）アクリレート基を表す）で示される片末端官能性オルガノポリシロキサンを製造する方法であって、近赤外線分光法を用いて重合反応中の反応液を分析することにより、６０～９５％の反応転化率になった時、反応を停止する片末端官能性オルガノポリシロキサンの製造方法。【選択図】なし