BIAXIALLY ORIENTED, LONG IN ONE DIRECTION, POLYETHYLENE 2,6-NAPHTHALATE FILM AND MAGENTIC TAPE USING IT

• Main Authors: ETZU, MASAMI, SAEKI, YASUHIRO, HAMANO, HISASHI, HOSOI, MASAHIRO
• Format: Patent
• Language: English; Korean
• Published: 15.01.1999
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

(A) (a) 0.05~0.3㎛의 평균 입경을 갖는 제1불활성 고체 입자 0.05~0.4 중량% 및 (b) 0.3~1.0㎛의 평균 입경(이 평균 입경은 제1불활성 고체입자의 평균 입경 보다 적어도 0.2㎛가 크다.)을 갖는 제2불활성 고체입자 0.005~0.05 중량%를 함유하고, (B) 길이방향의 영(young)의 탄성율은 적어도 650㎏/㎟ 이고, 너비 방향의 영의 탄성율은 적어도 600㎏/㎟ 이며, 길이방향의 영의 탄성율이 너비방향의 영의 탄성율보다 크고, (C) 70℃로 1시간 무하중 열처리에 의한 길이방향 열수축율은 0.08% 이하이며, (D) 표면거칠기, Ra가 3~10nm인 양측 배향성의 단일방향으로 긴 폴리에틸렌 -2,6- 나프탈레이트 필름이 개시된다. A biaxially oriented, unidirectionally long polyethylene-2,6-naphthalate film, (A) which contains (a) 0.05 to 04 % by weight of first inert solid particles having an average particle diameter of 0.05 to 0.3 mu m, and (b) 0.005 to 0.05 % by weight of second inert solid particles having an average particle diameter of 0.3 to 1.0 mu m, this average particle diameter being greater than the average particle diameter of the first inert solid particles by at least 0.2 mu m, wherein: (B) the Young's modulus in the length direction is at least 650 kg/mm , the Young's modulus in the width direction is at least 600 kg/mm , the Young's modulus in the length direction is greater than the Young's modulus in the width direction, (C) the heat shrinkage factor in the length direction in heat treatment at 70 DEG C for 1 hour under no load is not more than 0.08 %, and (D) the surface roughness, Ra, is 3 to 10 nm; and a magnetic tape obtained therefrom.