TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The other alkylene oxide is selected from propylene oxide, styrene oxide, 2-(2-methoxyethoxy)ethyl-glycidyl ether (MEEGE) and butylene oxide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Method: The step (b) involves adding the defined amount of further ethylene oxide over a defined period of time, followed by a period of not adding any further ethylene oxide; adding a defined amount of further ethylene oxide to the reaction mixture at least twice, preferably over a defined period of time, whilst the polymerization reaction is in progress, each addition being followed by a period of not adding any further ethylene oxide to the reaction mixture; and adding a defined amount of ethylene oxide to the reaction mixture in repeated intervals, whilst the polymerization reaction is in progress, each addition being followed by a period of not adding any further ethylene oxide to the reaction mixture. The method (M1) further involves adding a defined amount of additional the other alkylene oxide at least once. The polymerization reaction is performed at ambient pressure and at greater than or equal to50degreesC. The ambient pressure is a pressure of 104-106 Pa. The polymerization reaction is performed in the presence of a catalyst (preferably catalyst containing calcium). The method involves the repeated intervals including a period of adding a defined amount of ethylene oxide to the reaction mixture, each addition is followed by a period of not adding any further ethylene oxide to the reaction mixture. The molar ratio of ethylene oxide to the other alkylene oxide is 100-1.01 (preferably 6.67-1.34) in the copolymer. Preferred product: The compound (A1) has a molecular weight of 104-107 (preferably 105-107, more preferably 105-106); and a crystallinity grater than 85 (preferably grater than 45, more preferably greater than or equal to26, especially 1-26)%. The compound (A1) has an alkyleneoxide-comonomer content of 1-99 (preferably 15-75) mol.%; and has a multiblock tapered structure. EXAMPLE - A four necked flask fitted with mechanical stirrer, condenser, and inlet tube, was heated and purged with dry argon. Liquid ammonia (70 ml) was added and then calcium (0.5 g). The resulting blue solution was treated with a mixture of propylene oxide and acetonitrile at 50degreesC. The molar ratio of calcium to modifiers was 1:1 and the molar ratio of propylene oxide to acetonitrile was 3:2. Ammonia was stripped off and the residue was slurried with 25 ml of isooctane (but heptane can be used as well). The catalyst was aged for 2 hours at reflux. Then isooctane (75 ml) were added to the cooled catalyst suspension. A propylene oxide (PO) (25 g) was added to the catalyst suspension in isooctane. At zero time ethylene oxide (EO) was bubbled through the reaction mixture under stirring. The consumption of the comonomer was monitored by gas chromatography. At certain intervals additional amounts of the comonomer were added e.g. in the case of butylene oxide (BO) because of its lower reactivity. After work-up poly(ethylene oxide-co-propylene oxide) copolymer (31.5 g per 3 hours, and having molecular weight of 4x105) was obtained.